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cansas_reader.py

Timestamp:

Sep 15, 2016 8:33:57 AM (8 years ago)

Author:

Piotr Rozyczko <rozyczko@…>

Branches:

ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc

Children:

158cb9e

Parents:

2a08cb6

git-author:

Jeff Krzywon <krzywon@…> (08/18/16 12:52:59)

git-committer:

Piotr Rozyczko <rozyczko@…> (09/15/16 08:33:57)

Message:

Closes #596: Major rewrite to canSAS XML reader to create separate Data1D objects for each SASdata. Also fixed a few bugs that were present in the reader, that were not caught until now.

File:

: 1 edited

src/sas/sascalc/dataloader/readers/cansas_reader.py (modified) (15 diffs)

Legend:

: Unmodified
: Added
: Removed

src/sas/sascalc/dataloader/readers/cansas_reader.py

-                      ref51b63
+                      ra40be8c
 import logging
 import numpy
+import numpy as np
 import os
 import sys
 …
 import inspect
 # For saving individual sections of data
+from sas.sascalc.dataloader.data_info import Data1D
+from sas.sascalc.dataloader.data_info import Collimation
+from sas.sascalc.dataloader.data_info import TransmissionSpectrum
+from sas.sascalc.dataloader.data_info import Detector
+from sas.sascalc.dataloader.data_info import Process
+from sas.sascalc.dataloader.data_info import Aperture
+from sas.sascalc.dataloader.data_info import Data1D, DataInfo, plottable_1D
+from sas.sascalc.dataloader.data_info import Collimation, TransmissionSpectrum, Detector, Process, Aperture
+from sas.sascalc.dataloader.data_info import combine_data_info_with_plottable as combine_data
 import sas.sascalc.dataloader.readers.xml_reader as xml_reader
 from sas.sascalc.dataloader.readers.xml_reader import XMLreader
 from sas.sascalc.dataloader.readers.cansas_constants import CansasConstants
+from sas.sascalc.dataloader.readers.cansas_constants import CansasConstants, CurrentLevel
 # The following 2 imports *ARE* used. Do not remove either.
 …
 from xml.dom.minidom import parseString
-## TODO: Refactor to load multiple <SASData> as separate Data1D objects
-## TODO: Refactor to allow invalid XML, but give a useful warning when loaded
-_ZERO = 1e-16
 PREPROCESS = "xmlpreprocess"
 ENCODING = "encoding"
 RUN_NAME_DEFAULT = "None"
+INVALID_SCHEMA_PATH_1_1 = "{0}/sas/sascalc/dataloader/readers/schema/cansas1d_invalid_v1_1.xsd"
+INVALID_SCHEMA_PATH_1_0 = "{0}/sas/sascalc/dataloader/readers/schema/cansas1d_invalid_v1_0.xsd"
+INVALID_XML = "\n\nThe loaded xml file, {0} does not fully meet the CanSAS v1.x specification. SasView loaded " + \
+              "as much of the data as possible.\n\n"
 HAS_CONVERTER = True
 try:
 …
 ALLOW_ALL = True
-# DO NOT REMOVE Called by outside packages:
-#    sas.sasgui.perspectives.invariant.invariant_state
-#    sas.sasgui.perspectives.fitting.pagestate
-def get_content(location, node):
-    """
-    Get the first instance of the content of a xpath location.
-    :param location: xpath location
-    :param node: node to start at
-    :return: Element, or None
-    """
-    nodes = node.xpath(location,
-                       namespaces={'ns': CANSAS_NS.get("1.0").get("ns")})
-    if len(nodes) > 0:
-        return nodes[0]
-    else:
-        return None
-# DO NOT REMOVE Called by outside packages:
-#    sas.sasgui.perspectives.fitting.pagestate
-def write_node(doc, parent, name, value, attr=None):
-    """
-    :param doc: document DOM
-    :param parent: parent node
-    :param name: tag of the element
-    :param value: value of the child text node
-    :param attr: attribute dictionary
-    :return: True if something was appended, otherwise False
-    """
-    if attr is None:
-        attr = {}
-    if value is not None:
-        node = doc.createElement(name)
-        node.appendChild(doc.createTextNode(str(value)))
-        for item in attr:
-            node.setAttribute(item, attr[item])
-        parent.appendChild(node)
-        return True
-    return False
 class Reader(XMLreader):
     """
 …
         The CanSAS reader requires PyXML 0.8.4 or later.
     """
     ##CanSAS version - defaults to version 1.0
+    ## CanSAS version - defaults to version 1.0
     cansas_version = "1.0"
     base_ns = "{cansas1d/1.0}"
+    cansas_defaults = None
+    type_name = "canSAS"
+    invalid = True
+    ## Log messages and errors
     logging = None
+    errors = None
+    type_name = "canSAS"
+    errors = set()
+    ## Namespace hierarchy for current xml_file object
+    names = None
+    ns_list = None
+    ## Temporary storage location for loading multiple data sets in a single file
+    current_datainfo = None
+    current_dataset = None
+    current_data1d = None
+    data = None
+    ## List of data1D objects to be sent back to SasView
+    output = None
     ## Wildcards
     type = ["XML files (*.xml)|*.xml", "SasView Save Files (*.svs)|*.svs"]
 …
     allow_all = True
+    def __init__(self):
+        ## List of errors
+        self.errors = set()
+    def reset_state(self):
+        """
+        Resets the class state to a base case when loading a new data file so previous
+        data files do not appear a second time
+        """
+        self.current_datainfo = None
+        self.current_dataset = None
+        self.current_data1d = None
+        self.data = []
+        self.process = Process()
+        self.transspectrum = TransmissionSpectrum()
+        self.aperture = Aperture()
+        self.collimation = Collimation()
+        self.detector = Detector()
+        self.names = []
+        self.cansas_defaults = {}
+        self.output = []
+        self.ns_list = None
         self.logging = []
         self.encoding = None
+    def read(self, xml_file, schema_path="", invalid=True):
+        """
+        Validate and read in an xml_file file in the canSAS format.
+        :param xml_file: A canSAS file path in proper XML format
+        :param schema_path: A file path to an XML schema to validate the xml_file against
+        """
+        # For every file loaded, reset everything to a base state
+        self.reset_state()
+        self.invalid = invalid
+        # Check that the file exists
+        if os.path.isfile(xml_file):
+            basename, extension = os.path.splitext(os.path.basename(xml_file))
+            # If the file type is not allowed, return nothing
+            if extension in self.ext or self.allow_all:
+                # Get the file location of
+                self.load_file_and_schema(xml_file, schema_path)
+                self.add_data_set()
+                # Try to load the file, but raise an error if unable to.
+                # Check the file matches the XML schema
+                try:
+                    self.is_cansas(extension)
+                    self.invalid = False
+                    # Get each SASentry from XML file and add it to a list.
+                    entry_list = self.xmlroot.xpath(
+                            '/ns:SASroot/ns:SASentry',
+                            namespaces={'ns': self.cansas_defaults.get("ns")})
+                    self.names.append("SASentry")
+                    # Get all preprocessing events and encoding
+                    self.set_processing_instructions()
+                    # Parse each <SASentry> item
+                    for entry in entry_list:
+                        # Create a new DataInfo object for every <SASentry>
+                        # Set the file name and then parse the entry.
+                        self.current_datainfo.filename = basename + extension
+                        self.current_datainfo.meta_data["loader"] = "CanSAS XML 1D"
+                        self.current_datainfo.meta_data[PREPROCESS] = \
+                            self.processing_instructions
+                        # Parse the XML SASentry
+                        self._parse_entry(entry)
+                        # Combine datasets with datainfo
+                        self.add_data_set()
+                except RuntimeError:
+                    # If the file does not match the schema, raise this error
+                    invalid_xml = self.find_invalid_xml()
+                    invalid_xml = INVALID_XML.format(basename + extension) + invalid_xml
+                    self.errors.add(invalid_xml)
+                    # Try again with an invalid CanSAS schema, that requires only a data set in each
+                    base_name = xml_reader.__file__
+                    base_name = base_name.replace("\\", "/")
+                    base = base_name.split("/sas/")[0]
+                    if self.cansas_version == "1.1":
+                        invalid_schema = INVALID_SCHEMA_PATH_1_1.format(base, self.cansas_defaults.get("schema"))
+                    else:
+                        invalid_schema = INVALID_SCHEMA_PATH_1_0.format(base, self.cansas_defaults.get("schema"))
+                    self.set_schema(invalid_schema)
+                    try:
+                        if self.invalid:
+                            if self.is_cansas():
+                                self.output = self.read(xml_file, invalid_schema, False)
+                            else:
+                                raise RuntimeError
+                        else:
+                            raise RuntimeError
+                    except RuntimeError:
+                        x = np.zeros(1)
+                        y = np.zeros(1)
+                        self.current_data1d = Data1D(x,y)
+                        self.current_data1d.errors = self.errors
+                        return [self.current_data1d]
+        else:
+            self.output.append("Not a valid file path.")
+        # Return a list of parsed entries that dataloader can manage
+        return self.output
+    def _parse_entry(self, dom):
+        """
+        Parse a SASEntry - new recursive method for parsing the dom of
+            the CanSAS data format. This will allow multiple data files
+            and extra nodes to be read in simultaneously.
+        :param dom: dom object with a namespace base of names
+        """
+        self._check_for_empty_data()
+        self.base_ns = "{0}{1}{2}".format("{", \
+                            CANSAS_NS.get(self.cansas_version).get("ns"), "}")
+        tagname = ''
+        tagname_original = ''
+        # Go through each child in the parent element
+        for node in dom:
+            # Get the element name and set the current names level
+            tagname = node.tag.replace(self.base_ns, "")
+            tagname_original = tagname
+            # Skip this iteration when loading in save state information
+            if tagname == "fitting_plug_in" or tagname == "pr_inversion" or tagname == "invariant":
+                continue
+            # Get where to store content
+            self.names.append(tagname_original)
+            self.ns_list = CONSTANTS.iterate_namespace(self.names)
+            # If the element is a child element, recurse
+            if len(node.getchildren()) > 0:
+                self.parent_class = tagname_original
+                if tagname == 'SASdata':
+                    self._initialize_new_data_set()
+                ## Recursion step to access data within the group
+                self._parse_entry(node)
+                self.add_intermediate()
+            else:
+                data_point, unit = self._get_node_value(node, tagname)
+                ## If this is a dataset, store the data appropriately
+                if tagname == 'Run':
+                    self.current_datainfo.run.append(data_point)
+                elif tagname == 'Title':
+                    self.current_datainfo.title = data_point
+                elif tagname == 'SASnote':
+                    self.current_datainfo.notes.append(data_point)
+                ## I and Q Data
+                elif tagname == 'I':
+                    self.current_dataset.yaxis("Intensity", unit)
+                    self.current_dataset.y = np.append(self.current_dataset.y, data_point)
+                elif tagname == 'Idev':
+                    self.current_dataset.dy = np.append(self.current_dataset.dy, data_point)
+                elif tagname == 'Q':
+                    self.current_dataset.xaxis("Q", unit)
+                    self.current_dataset.x = np.append(self.current_dataset.x, data_point)
+                elif tagname == 'Qdev':
+                    self.current_dataset.dx = np.append(self.current_dataset.dx, data_point)
+                elif tagname == 'dQw':
+                    self.current_dataset.dxw = np.append(self.current_dataset.dxw, data_point)
+                elif tagname == 'dQl':
+                    self.current_dataset.dxl = np.append(self.current_dataset.dxl, data_point)
+                ## Sample Information
+                elif tagname == 'ID' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.ID = data_point
+                elif tagname == 'Title' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.name = data_point
+                elif tagname == 'thickness' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.thickness = data_point
+                    self.current_datainfo.sample.thickness_unit = unit
+                elif tagname == 'transmission' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.transmission = data_point
+                elif tagname == 'temperature' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.temperature = data_point
+                    self.current_datainfo.sample.temperature_unit = unit
+                elif tagname == 'details' and self.parent_class == 'SASsample':
+                    self.current_datainfo.sample.details.append(data_point)
+                elif tagname == 'x' and self.parent_class == 'position':
+                    self.current_datainfo.sample.position.x = data_point
+                    self.current_datainfo.sample.position_unit = unit
+                elif tagname == 'y' and self.parent_class == 'position':
+                    self.current_datainfo.sample.position.y = data_point
+                    self.current_datainfo.sample.position_unit = unit
+                elif tagname == 'z' and self.parent_class == 'position':
+                    self.current_datainfo.sample.position.z = data_point
+                    self.current_datainfo.sample.position_unit = unit
+                elif tagname == 'roll' and self.parent_class == 'orientation' and 'SASsample' in self.names:
+                    self.current_datainfo.sample.orientation.x = data_point
+                    self.current_datainfo.sample.orientation_unit = unit
+                elif tagname == 'pitch' and self.parent_class == 'orientation' and 'SASsample' in self.names:
+                    self.current_datainfo.sample.orientation.y = data_point
+                    self.current_datainfo.sample.orientation_unit = unit
+                elif tagname == 'yaw' and self.parent_class == 'orientation' and 'SASsample' in self.names:
+                    self.current_datainfo.sample.orientation.z = data_point
+                    self.current_datainfo.sample.orientation_unit = unit
+                ## Instrumental Information
+                elif tagname == 'name' and self.parent_class == 'SASinstrument':
+                    self.current_datainfo.instrument = data_point
+                ## Detector Information
+                elif tagname == 'name' and self.parent_class == 'SASdetector':
+                    self.detector.name = data_point
+                elif tagname == 'SDD' and self.parent_class == 'SASdetector':
+                    self.detector.distance = data_point
+                    self.detector.distance_unit = unit
+                elif tagname == 'slit_length' and self.parent_class == 'SASdetector':
+                    self.detector.slit_length = data_point
+                    self.detector.slit_length_unit = unit
+                elif tagname == 'x' and self.parent_class == 'offset':
+                    self.detector.offset.x = data_point
+                    self.detector.offset_unit = unit
+                elif tagname == 'y' and self.parent_class == 'offset':
+                    self.detector.offset.y = data_point
+                    self.detector.offset_unit = unit
+                elif tagname == 'z' and self.parent_class == 'offset':
+                    self.detector.offset.z = data_point
+                    self.detector.offset_unit = unit
+                elif tagname == 'x' and self.parent_class == 'beam_center':
+                    self.detector.beam_center.x = data_point
+                    self.detector.beam_center_unit = unit
+                elif tagname == 'y' and self.parent_class == 'beam_center':
+                    self.detector.beam_center.y = data_point
+                    self.detector.beam_center_unit = unit
+                elif tagname == 'z' and self.parent_class == 'beam_center':
+                    self.detector.beam_center.z = data_point
+                    self.detector.beam_center_unit = unit
+                elif tagname == 'x' and self.parent_class == 'pixel_size':
+                    self.detector.pixel_size.x = data_point
+                    self.detector.pixel_size_unit = unit
+                elif tagname == 'y' and self.parent_class == 'pixel_size':
+                    self.detector.pixel_size.y = data_point
+                    self.detector.pixel_size_unit = unit
+                elif tagname == 'z' and self.parent_class == 'pixel_size':
+                    self.detector.pixel_size.z = data_point
+                    self.detector.pixel_size_unit = unit
+                elif tagname == 'roll' and self.parent_class == 'orientation' and 'SASdetector' in self.names:
+                    self.detector.orientation.x = data_point
+                    self.detector.orientation_unit = unit
+                elif tagname == 'pitch' and self.parent_class == 'orientation' and 'SASdetector' in self.names:
+                    self.detector.orientation.y = data_point
+                    self.detector.orientation_unit = unit
+                elif tagname == 'yaw' and self.parent_class == 'orientation' and 'SASdetector' in self.names:
+                    self.detector.orientation.z = data_point
+                    self.detector.orientation_unit = unit
+                ## Collimation and Aperture
+                elif tagname == 'length' and self.parent_class == 'SAScollimation':
+                    self.collimation.length = data_point
+                    self.collimation.length_unit = unit
+                elif tagname == 'name' and self.parent_class == 'SAScollimation':
+                    self.collimation.name = data_point
+                elif tagname == 'distance' and self.parent_class == 'aperture':
+                    self.aperture.distance = data_point
+                    self.aperture.distance_unit = unit
+                elif tagname == 'x' and self.parent_class == 'size':
+                    self.aperture.size.x = data_point
+                    self.collimation.size_unit = unit
+                elif tagname == 'y' and self.parent_class == 'size':
+                    self.aperture.size.y = data_point
+                    self.collimation.size_unit = unit
+                elif tagname == 'z' and self.parent_class == 'size':
+                    self.aperture.size.z = data_point
+                    self.collimation.size_unit = unit
+                ## Process Information
+                elif tagname == 'name' and self.parent_class == 'SASprocess':
+                    self.process.name = data_point
+                elif tagname == 'description' and self.parent_class == 'SASprocess':
+                    self.process.description = data_point
+                elif tagname == 'date' and self.parent_class == 'SASprocess':
+                    try:
+                        self.process.date = datetime.datetime.fromtimestamp(data_point)
+                    except:
+                        self.process.date = data_point
+                elif tagname == 'SASprocessnote':
+                    self.process.notes.append(data_point)
+                elif tagname == 'term' and self.parent_class == 'SASprocess':
+                    self.process.term.append(data_point)
+                ## Transmission Spectrum
+                elif tagname == 'T' and self.parent_class == 'Tdata':
+                    self.transspectrum.transmission = np.append(self.transspectrum.transmission, data_point)
+                    self.transspectrum.transmission_unit = unit
+                elif tagname == 'Tdev' and self.parent_class == 'Tdata':
+                    self.transspectrum.transmission_deviation = np.append(self.transspectrum.transmission_deviation, data_point)
+                    self.transspectrum.transmission_deviation_unit = unit
+                elif tagname == 'Lambda' and self.parent_class == 'Tdata':
+                    self.transspectrum.wavelength = np.append(self.transspectrum.wavelength, data_point)
+                    self.transspectrum.wavelength_unit = unit
+                ## Source Information
+                elif tagname == 'wavelength' and (self.parent_class == 'SASsource' or self.parent_class == 'SASData'):
+                    self.current_datainfo.source.wavelength = data_point
+                    self.current_datainfo.source.wavelength_unit = unit
+                elif tagname == 'wavelength_min' and self.parent_class == 'SASsource':
+                    self.current_datainfo.source.wavelength_min = data_point
+                    self.current_datainfo.source.wavelength_min_unit = unit
+                elif tagname == 'wavelength_max' and self.parent_class == 'SASsource':
+                    self.current_datainfo.source.wavelength_max = data_point
+                    self.current_datainfo.source.wavelength_max_unit = unit
+                elif tagname == 'wavelength_spread' and self.parent_class == 'SASsource':
+                    self.current_datainfo.source.wavelength_spread = data_point
+                    self.current_datainfo.source.wavelength_spread_unit = unit
+                elif tagname == 'x' and self.parent_class == 'beam_size':
+                    self.current_datainfo.source.beam_size.x = data_point
+                    self.current_datainfo.source.beam_size_unit = unit
+                elif tagname == 'y' and self.parent_class == 'beam_size':
+                    self.current_datainfo.source.beam_size.y = data_point
+                    self.current_datainfo.source.beam_size_unit = unit
+                elif tagname == 'z' and self.parent_class == 'pixel_size':
+                    self.current_datainfo.source.data_point.z = data_point
+                    self.current_datainfo.source.beam_size_unit = unit
+                elif tagname == 'radiation' and self.parent_class == 'SASsource':
+                    self.current_datainfo.source.radiation = data_point
+                elif tagname == 'beam_shape' and self.parent_class == 'SASsource':
+                    self.current_datainfo.source.beam_shape = data_point
+                ## Everything else goes in meta_data
+                else:
+                    new_key = self._create_unique_key(self.current_datainfo.meta_data, tagname)
+                    self.current_datainfo.meta_data[new_key] = data_point
+            self.names.remove(tagname_original)
+            length = 0
+            if len(self.names) > 1:
+                length = len(self.names) - 1
+            self.parent_class = self.names[length]
     def is_cansas(self, ext="xml"):
 …
         if ext == "svs":
             return True
         return False
+        raise RuntimeError
     def load_file_and_schema(self, xml_file, schema_path=""):
         """
         Loads the file and associates a schema, if a known schema exists
+        Loads the file and associates a schema, if a schema is passed in or if one already exists
         :param xml_file: The xml file path sent to Reader.read
+        :param schema_path: The path to a schema associated with the xml_file, or find one based on the file
         """
         base_name = xml_reader.__file__
 …
         # Generic values for the cansas file based on the version
         cansas_defaults = CANSAS_NS.get(self.cansas_version, "1.0")
+        self.cansas_defaults = CANSAS_NS.get(self.cansas_version, "1.0")
         if schema_path == "":
             schema_path = "{0}/sas/sascalc/dataloader/readers/schema/{1}".format\
                 (base, cansas_defaults.get("schema")).replace("\\", "/")
+            schema_path = "{0}/sas/sascalc/dataloader/readers/schema/{1}".format \
+                (base, self.cansas_defaults.get("schema")).replace("\\", "/")
         # Link a schema to the XML file.
         self.set_schema(schema_path)
+        return cansas_defaults
+    ## TODO: Test loading invalid CanSAS XML files and see if this works
+    ## TODO: Once works, try adding a warning that the data is invalid
+    def read(self, xml_file, schema_path=""):
+        """
+        Validate and read in an xml_file file in the canSAS format.
+        :param xml_file: A canSAS file path in proper XML format
+        """
+        # output - Final list of Data1D objects
+        output = []
+        # ns - Namespace hierarchy for current xml_file object
+        ns_list = []
+        # Check that the file exists
+        if os.path.isfile(xml_file):
+            basename = os.path.basename(xml_file)
+            _, extension = os.path.splitext(basename)
+            # If the file type is not allowed, return nothing
+            if extension in self.ext or self.allow_all:
+                # Get the file location of
+                cansas_defaults = self.load_file_and_schema(xml_file, schema_path)
+                # Try to load the file, but raise an error if unable to.
+                # Check the file matches the XML schema
+                try:
+                    if self.is_cansas(extension):
+                        # Get each SASentry from XML file and add it to a list.
+                        entry_list = self.xmlroot.xpath(
+                                '/ns:SASroot/ns:SASentry',
+                                namespaces={'ns': cansas_defaults.get("ns")})
+                        ns_list.append("SASentry")
+                        # If multiple files, modify the name for each is unique
+                        increment = 0
+                        # Parse each SASentry item
+                        for entry in entry_list:
+                            # Define a new Data1D object with zeroes for
+                            # x_vals and y_vals
+                            data1d = Data1D(numpy.empty(0), numpy.empty(0),
+                                            numpy.empty(0), numpy.empty(0))
+                            data1d.dxl = numpy.empty(0)
+                            data1d.dxw = numpy.empty(0)
+                            # If more than one SASentry, increment each in order
+                            name = basename
+                            if len(entry_list) - 1 > 0:
+                                name += "_{0}".format(increment)
+                                increment += 1
+                            # Set the Data1D name and then parse the entry.
+                            # The entry is appended to a list of entry values
+                            data1d.filename = name
+                            data1d.meta_data["loader"] = "CanSAS 1D"
+                            # Get all preprocessing events and encoding
+                            self.set_processing_instructions()
+                            data1d.meta_data[PREPROCESS] = \
+                                    self.processing_instructions
+                            # Parse the XML file
+                            return_value, extras = \
+                                self._parse_entry(entry, ns_list, data1d)
+                            del extras[:]
+                            return_value = self._final_cleanup(return_value)
+                            output.append(return_value)
+                    else:
+                        raise RuntimeError, "Invalid XML at: {0}".format(\
+                                                    self.find_invalid_xml())
+                except:
+                    # If the file does not match the schema, raise this error
+                    schema_path = "{0}/sas/sascalc/dataloader/readers/schema/cansas1d_invalid.xsd"
+                    invalid_xml = self.find_invalid_xml()
+                    invalid_xml = "\n\nThe loaded xml file does not fully meet the CanSAS v1.x specification. SasView " + \
+                                  "loaded as much of the data as possible.\n\n" + invalid_xml
+                    self.errors.add(invalid_xml)
+                    self.set_schema(schema_path)
+                    if self.is_cansas():
+                        output = self.read(xml_file, schema_path)
+                    else:
+                        raise RuntimeError, "%s cannot be read" % xml_file
+                return output
+        # Return a list of parsed entries that dataloader can manage
+        return None
+    def _final_cleanup(self, data1d):
+    def add_data_set(self):
+        """
+        Adds the current_dataset to the list of outputs after preforming final processing on the data and then calls a
+        private method to generate a new data set.
+        :param key: NeXus group name for current tree level
+        """
+        if self.current_datainfo and self.current_dataset:
+            self._final_cleanup()
+        self.data = []
+        self.current_datainfo = DataInfo()
+    def _initialize_new_data_set(self, parent_list=None):
+        """
+        A private class method to generate a new 1D data object.
+        Outside methods should call add_data_set() to be sure any existing data is stored properly.
+        :param parent_list: List of names of parent elements
+        """
+        if parent_list is None:
+            parent_list = []
+        x = np.array(0)
+        y = np.array(0)
+        self.current_dataset = plottable_1D(x, y)
+    def add_intermediate(self):
+        """
+        This method stores any intermediate objects within the final data set after fully reading the set.
+        :param parent: The NXclass name for the h5py Group object that just finished being processed
+        """
+        if self.parent_class == 'SASprocess':
+            self.current_datainfo.process.append(self.process)
+            self.process = Process()
+        elif self.parent_class == 'SASdetector':
+            self.current_datainfo.detector.append(self.detector)
+            self.detector = Detector()
+        elif self.parent_class == 'SAStransmission_spectrum':
+            self.current_datainfo.trans_spectrum.append(self.transspectrum)
+            self.transspectrum = TransmissionSpectrum()
+        elif self.parent_class == 'SAScollimation':
+            self.current_datainfo.collimation.append(self.collimation)
+            self.collimation = Collimation()
+        elif self.parent_class == 'SASaperture':
+            self.collimation.aperture.append(self.aperture)
+            self.aperture = Aperture()
+        elif self.parent_class == 'SASdata':
+            self._check_for_empty_resolution()
+            self.data.append(self.current_dataset)
+    def _final_cleanup(self):
         """
         Final cleanup of the Data1D object to be sure it has all the
         appropriate information needed for perspectives
+        :param data1d: Data1D object that has been populated
+        """
+        # Final cleanup
+        # Remove empty nodes, verify array sizes are correct
+        """
+        ## Append errors to dataset and reset class errors
+        self.current_datainfo.errors = set()
         for error in self.errors:
             data1d.errors.append(error)
+            self.current_datainfo.errors.add(error)
         self.errors.clear()
+        numpy.trim_zeros(data1d.x)
+        numpy.trim_zeros(data1d.y)
+        numpy.trim_zeros(data1d.dy)
+        size_dx = data1d.dx.size
+        size_dxl = data1d.dxl.size
+        size_dxw = data1d.dxw.size
+        if data1d._xunit != data1d.x_unit:
+            data1d.x_unit = data1d._xunit
+        if data1d._yunit != data1d.y_unit:
+            data1d.y_unit = data1d._yunit
+        if size_dxl == 0 and size_dxw == 0:
+            data1d.dxl = None
+            data1d.dxw = None
+            numpy.trim_zeros(data1d.dx)
+        elif size_dx == 0:
+            data1d.dx = None
+            size_dx = size_dxl
+            numpy.trim_zeros(data1d.dxl)
+            numpy.trim_zeros(data1d.dxw)
+        return data1d
+        ## Combine all plottables with datainfo and append each to output
+        ## Type cast data arrays to float64 and find min/max as appropriate
+        for dataset in self.data:
+            if dataset.x is not None:
+                dataset.x = np.delete(dataset.x, [0])
+                dataset.x = dataset.x.astype(np.float64)
+                dataset.xmin = np.min(dataset.x)
+                dataset.xmax = np.max(dataset.x)
+            if dataset.y is not None:
+                dataset.y = np.delete(dataset.y, [0])
+                dataset.y = dataset.y.astype(np.float64)
+                dataset.ymin = np.min(dataset.y)
+                dataset.ymax = np.max(dataset.y)
+            if dataset.dx is not None:
+                dataset.dx = np.delete(dataset.dx, [0])
+                dataset.dx = dataset.dx.astype(np.float64)
+            if dataset.dxl is not None:
+                dataset.dxl = np.delete(dataset.dxl, [0])
+                dataset.dxl = dataset.dxl.astype(np.float64)
+            if dataset.dxw is not None:
+                dataset.dxw = np.delete(dataset.dxw, [0])
+                dataset.dxw = dataset.dxw.astype(np.float64)
+            if dataset.dy is not None:
+                dataset.dy = np.delete(dataset.dy, [0])
+                dataset.dy = dataset.dy.astype(np.float64)
+            np.trim_zeros(dataset.x)
+            np.trim_zeros(dataset.y)
+            np.trim_zeros(dataset.dy)
+            final_dataset = combine_data(dataset, self.current_datainfo)
+            self.output.append(final_dataset)
     def _create_unique_key(self, dictionary, name, numb=0):
         """
         Create a unique key value for any dictionary to prevent overwriting
         Recurses until a unique key value is found.
+        Recurse until a unique key value is found.
         :param dictionary: A dictionary with any number of entries
 …
         return name
+    def _unit_conversion(self, node, new_current_level, data1d, \
+                                                tagname, node_value):
+    def _get_node_value(self, node, tagname):
+        """
+        Get the value of a node and any applicable units
+        :param node: The XML node to get the value of
+        :param tagname: The tagname of the node
+        """
+        #Get the text from the node and convert all whitespace to spaces
+        units = ''
+        node_value = node.text
+        if node_value is not None:
+            node_value = ' '.join(node_value.split())
+        else:
+            node_value = ""
+        # If the value is a float, compile with units.
+        if self.ns_list.ns_datatype == "float":
+            # If an empty value is given, set as zero.
+            if node_value is None or node_value.isspace() \
+                                    or node_value.lower() == "nan":
+                node_value = "0.0"
+            #Convert the value to the base units
+            node_value, units = self._unit_conversion(node, tagname, node_value)
+        # If the value is a timestamp, convert to a datetime object
+        elif self.ns_list.ns_datatype == "timestamp":
+            if node_value is None or node_value.isspace():
+                pass
+            else:
+                try:
+                    node_value = \
+                        datetime.datetime.fromtimestamp(node_value)
+                except ValueError:
+                    node_value = None
+        return node_value, units
+    def _unit_conversion(self, node, tagname, node_value):
         """
         A unit converter method used to convert the data included in the file
         to the default units listed in data_info
+        :param new_current_level: cansas_constants level as returned by
+            iterate_namespace
+        :param attr: The attributes of the node
+        :param data1d: Where the values will be saved
+        :param node: XML node
+        :param tagname: name of the node
         :param node_value: The value of the current dom node
         """
 …
         err_msg = None
         default_unit = None
         if 'unit' in attr and new_current_level.get('unit') is not None:
+        if 'unit' in attr and attr.get('unit') is not None and not self.ns_list.ns_optional:
             try:
                 local_unit = attr['unit']
+                if isinstance(node_value, float) is False:
+                    exec("node_value = float({0})".format(node_value))
+                unitname = new_current_level.get("unit")
+                exec "default_unit = data1d.{0}".format(unitname)
+                if local_unit is not None and default_unit is not None and \
+                        local_unit.lower() != default_unit.lower() \
+                if not isinstance(node_value, float):
+                    node_value = float(node_value)
+                unitname = self.ns_list.current_level.get("unit", "")
+                if "SASdetector" in self.names:
+                    save_in = "detector"
+                elif "aperture" in self.names:
+                    save_in = "aperture"
+                elif "SAScollimation" in self.names:
+                    save_in = "collimation"
+                elif "SAStransmission_spectrum" in self.names:
+                    save_in = "transspectrum"
+                elif "SASdata" in self.names:
+                    x = np.zeros(1)
+                    y = np.zeros(1)
+                    self.current_data1d = Data1D(x, y)
+                    save_in = "current_data1d"
+                elif "SASsource" in self.names:
+                    save_in = "current_datainfo.source"
+                elif "SASsample" in self.names:
+                    save_in = "current_datainfo.sample"
+                elif "SASprocess" in self.names:
+                    save_in = "process"
+                else:
+                    save_in = "current_datainfo"
+                exec "default_unit = self.{0}.{1}".format(save_in, unitname)
+                if local_unit and default_unit and local_unit.lower() != default_unit.lower() \
                         and local_unit.lower() != "none":
                     if HAS_CONVERTER == True:
 …
         if err_msg:
             self.errors.add(err_msg)
-        node_value = "float({0})".format(node_value)
         return node_value, value_unit
     def _check_for_empty_data(self, data1d):
+    def _check_for_empty_data(self):
         """
         Creates an empty data set if no data is passed to the reader
 …
         :param data1d: presumably a Data1D object
         """
+        if data1d == None:
+            self.errors = set()
+            x_vals = numpy.empty(0)
+            y_vals = numpy.empty(0)
+            dx_vals = numpy.empty(0)
+            dy_vals = numpy.empty(0)
+            dxl = numpy.empty(0)
+            dxw = numpy.empty(0)
+            data1d = Data1D(x_vals, y_vals, dx_vals, dy_vals)
+            data1d.dxl = dxl
+            data1d.dxw = dxw
+        return data1d
+    def _handle_special_cases(self, tagname, data1d, children):
+        """
+        Handle cases where the data type in Data1D is a dictionary or list
+        :param tagname: XML tagname in use
+        :param data1d: The original Data1D object
+        :param children: Child nodes of node
+        :param node: existing node with tag name 'tagname'
+        """
+        if tagname == "SASdetector":
+            data1d = Detector()
+        elif tagname == "SAScollimation":
+            data1d = Collimation()
+        elif tagname == "SAStransmission_spectrum":
+            data1d = TransmissionSpectrum()
+        elif tagname == "SASprocess":
+            data1d = Process()
+            for child in children:
+                if child.tag.replace(self.base_ns, "") == "term":
+                    term_attr = {}
+                    for attr in child.keys():
+                        term_attr[attr] = \
+                            ' '.join(child.get(attr).split())
+                    if child.text is not None:
+                        term_attr['value'] = \
+                            ' '.join(child.text.split())
+                    data1d.term.append(term_attr)
+        elif tagname == "aperture":
+            data1d = Aperture()
+        if tagname == "Idata" and children is not None:
+            data1d = self._check_for_empty_resolution(data1d, children)
+        return data1d
+    def _check_for_empty_resolution(self, data1d, children):
+        if self.current_dataset == None:
+            x_vals = np.empty(0)
+            y_vals = np.empty(0)
+            dx_vals = np.empty(0)
+            dy_vals = np.empty(0)
+            dxl = np.empty(0)
+            dxw = np.empty(0)
+            self.current_dataset = plottable_1D(x_vals, y_vals, dx_vals, dy_vals)
+            self.current_dataset.dxl = dxl
+            self.current_dataset.dxw = dxw
+    def _check_for_empty_resolution(self):
         """
         A method to check all resolution data sets are the same size as I and Q
 …
         dq_exists = False
         di_exists = False
+        for child in children:
+            tag = child.tag.replace(self.base_ns, "")
+            if tag == "dQl":
+                dql_exists = True
+            if tag == "dQw":
+                dqw_exists = True
+            if tag == "Qdev":
+                dq_exists = True
+            if tag == "Idev":
+                di_exists = True
+        if dqw_exists and dql_exists == False:
+            data1d.dxl = numpy.append(data1d.dxl, 0.0)
+        elif dql_exists and dqw_exists == False:
+            data1d.dxw = numpy.append(data1d.dxw, 0.0)
+        elif dql_exists == False and dqw_exists == False \
+                                            and dq_exists == False:
+            data1d.dx = numpy.append(data1d.dx, 0.0)
+        if di_exists == False:
+            data1d.dy = numpy.append(data1d.dy, 0.0)
+        return data1d
+    def _restore_original_case(self,
+                               tagname_original,
+                               tagname,
+                               save_data1d,
+                               data1d):
+        """
+        Save the special case data to the appropriate location and restore
+        the original Data1D object
+        :param tagname_original: Unmodified tagname for the node
+        :param tagname: modified tagname for the node
+        :param save_data1d: The original Data1D object
+        :param data1d: If a special case was handled, an object of that type
+        """
+        if tagname_original == "SASdetector":
+            save_data1d.detector.append(data1d)
+        elif tagname_original == "SAScollimation":
+            save_data1d.collimation.append(data1d)
+        elif tagname == "SAStransmission_spectrum":
+            save_data1d.trans_spectrum.append(data1d)
+        elif tagname_original == "SASprocess":
+            save_data1d.process.append(data1d)
+        elif tagname_original == "aperture":
+            save_data1d.aperture.append(data1d)
+        else:
+            save_data1d = data1d
+        return save_data1d
+    def _handle_attributes(self, node, data1d, cs_values, tagname):
+        """
+        Process all of the attributes for a node
+        """
+        attr = node.attrib
+        if attr is not None:
+            for key in node.keys():
+                try:
+                    node_value, unit = self._get_node_value(node, cs_values, \
+                                                   data1d, tagname)
+                    cansas_attrib = \
+                        cs_values.current_level.get("attributes").get(key)
+                    attrib_variable = cansas_attrib.get("variable")
+                    if key == 'unit' and unit != '':
+                        attrib_value = unit
+                    else:
+                        attrib_value = node.attrib[key]
+                    store_attr = attrib_variable.format("data1d",
+                                                        attrib_value,
+                                                        key,
+                                                        node_value)
+                    exec store_attr
+                except AttributeError:
+                    pass
+        return data1d
+    def _get_node_value(self, node, cs_values, data1d, tagname):
+        """
+        Get the value of a node and any applicable units
+        :param node: The XML node to get the value of
+        :param cs_values: A CansasConstants.CurrentLevel object
+        :param attr: The node attributes
+        :param dataid: The working object to be modified
+        :param tagname: The tagname of the node
+        """
+        #Get the text from the node and convert all whitespace to spaces
+        units = ''
+        node_value = node.text
+        if node_value == "":
+            node_value = None
+        if node_value is not None:
+            node_value = ' '.join(node_value.split())
+        # If the value is a float, compile with units.
+        if cs_values.ns_datatype == "float":
+            # If an empty value is given, set as zero.
+            if node_value is None or node_value.isspace() \
+                                    or node_value.lower() == "nan":
+                node_value = "0.0"
+            #Convert the value to the base units
+            node_value, units = self._unit_conversion(node, \
+                        cs_values.current_level, data1d, tagname, node_value)
+        # If the value is a timestamp, convert to a datetime object
+        elif cs_values.ns_datatype == "timestamp":
+            if node_value is None or node_value.isspace():
+                pass
+            else:
+                try:
+                    node_value = \
+                        datetime.datetime.fromtimestamp(node_value)
+                except ValueError:
+                    node_value = None
+        return node_value, units
+    def _parse_entry(self, dom, names=None, data1d=None, extras=None):
+        """
+        Parse a SASEntry - new recursive method for parsing the dom of
+            the CanSAS data format. This will allow multiple data files
+            and extra nodes to be read in simultaneously.
+        :param dom: dom object with a namespace base of names
+        :param names: A list of element names that lead up to the dom object
+        :param data1d: The data1d object that will be modified
+        :param extras: Any values that should go into meta_data when data1d
+            is not a Data1D object
+        """
+        if extras is None:
+            extras = []
+        if names is None or names == []:
+            names = ["SASentry"]
+        data1d = self._check_for_empty_data(data1d)
+        self.base_ns = "{0}{1}{2}".format("{", \
+                            CANSAS_NS.get(self.cansas_version).get("ns"), "}")
+        tagname = ''
+        tagname_original = ''
+        # Go through each child in the parent element
+        for node in dom:
+            try:
+                # Get the element name and set the current names level
+                tagname = node.tag.replace(self.base_ns, "")
+                tagname_original = tagname
+                if tagname == "fitting_plug_in" or tagname == "pr_inversion" or\
+                    tagname == "invariant":
+                    continue
+                names.append(tagname)
+                children = node.getchildren()
+                if len(children) == 0:
+                    children = None
+                save_data1d = data1d
+                # Look for special cases
+                data1d = self._handle_special_cases(tagname, data1d, children)
+                # Get where to store content
+                cs_values = CONSTANTS.iterate_namespace(names)
+                # If the element is a child element, recurse
+                if children is not None:
+                    # Returned value is new Data1D object with all previous and
+                    # new values in it.
+                    data1d, extras = self._parse_entry(node,
+                                                       names, data1d, extras)
+                #Get the information from the node
+                node_value, _ = self._get_node_value(node, cs_values, \
+                                                            data1d, tagname)
+                # If appending to a dictionary (meta_data | run_name)
+                # make sure the key is unique
+                if cs_values.ns_variable == "{0}.meta_data[\"{2}\"] = \"{1}\"":
+                    # If we are within a Process, Detector, Collimation or
+                    # Aperture instance, pull out old data1d
+                    tagname = self._create_unique_key(data1d.meta_data, \
+                                                      tagname, 0)
+                    if isinstance(data1d, Data1D) == False:
+                        store_me = cs_values.ns_variable.format("data1d", \
+                                                            node_value, tagname)
+                        extras.append(store_me)
+                        cs_values.ns_variable = None
+                if cs_values.ns_variable == "{0}.run_name[\"{2}\"] = \"{1}\"":
+                    tagname = self._create_unique_key(data1d.run_name, \
+                                                      tagname, 0)
+                # Check for Data1D object and any extra commands to save
+                if isinstance(data1d, Data1D):
+                    for item in extras:
+                        exec item
+                # Don't bother saving empty information unless it is a float
+                if cs_values.ns_variable is not None and \
+                            node_value is not None and \
+                            node_value.isspace() == False:
+                    # Format a string and then execute it.
+                    store_me = cs_values.ns_variable.format("data1d", \
+                                                            node_value, tagname)
+                    exec store_me
+                # Get attributes and process them
+                data1d = self._handle_attributes(node, data1d, cs_values, \
+                                                 tagname)
+            except TypeError:
+                pass
+            except Exception as excep:
+                exc_type, exc_obj, exc_tb = sys.exc_info()
+                fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
+                print(excep, exc_type, fname, exc_tb.tb_lineno, \
+                      tagname, exc_obj)
+            finally:
+                # Save special cases in original data1d object
+                # then restore the data1d
+                save_data1d = self._restore_original_case(tagname_original, \
+                                                tagname, save_data1d, data1d)
+                if tagname_original == "fitting_plug_in" or \
+                    tagname_original == "invariant" or \
+                    tagname_original == "pr_inversion":
+                    pass
+                else:
+                    data1d = save_data1d
+                    # Remove tagname from names to restore original base
+                    names.remove(tagname_original)
+        return data1d, extras
+    def _get_pi_string(self):
+        """
+        Creates the processing instructions header for writing to file
+        """
+        pis = self.return_processing_instructions()
+        if len(pis) > 0:
+            pi_tree = self.create_tree(pis[0])
+            i = 1
+            for i in range(1, len(pis) - 1):
+                pi_tree = self.append(pis[i], pi_tree)
+            pi_string = self.to_string(pi_tree)
+        else:
+            pi_string = ""
+        return pi_string
+    def _create_main_node(self):
+        """
+        Creates the primary xml header used when writing to file
+        """
+        xsi = "http://www.w3.org/2001/XMLSchema-instance"
+        version = self.cansas_version
+        n_s = CANSAS_NS.get(version).get("ns")
+        if version == "1.1":
+            url = "http://www.cansas.org/formats/1.1/"
+        else:
+            url = "http://svn.smallangles.net/svn/canSAS/1dwg/trunk/"
+        schema_location = "{0} {1}cansas1d.xsd".format(n_s, url)
+        attrib = {"{" + xsi + "}schemaLocation" : schema_location,
+                  "version" : version}
+        nsmap = {'xsi' : xsi, None: n_s}
+        main_node = self.create_element("{" + n_s + "}SASroot",
+                                        attrib=attrib, nsmap=nsmap)
+        return main_node
+    def _write_run_names(self, datainfo, entry_node):
+        """
+        Writes the run names to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        if datainfo.run == None or datainfo.run == []:
+            datainfo.run.append(RUN_NAME_DEFAULT)
+            datainfo.run_name[RUN_NAME_DEFAULT] = RUN_NAME_DEFAULT
+        for item in datainfo.run:
+            runname = {}
+            if item in datainfo.run_name and \
+            len(str(datainfo.run_name[item])) > 1:
+                runname = {'name': datainfo.run_name[item]}
+            self.write_node(entry_node, "Run", item, runname)
+    def _write_data(self, datainfo, entry_node):
+        """
+        Writes the I and Q data to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        node = self.create_element("SASdata")
+        self.append(node, entry_node)
+        for i in range(len(datainfo.x)):
+            point = self.create_element("Idata")
+            node.append(point)
+            self.write_node(point, "Q", datainfo.x[i],
+                            {'unit': datainfo.x_unit})
+            if len(datainfo.y) >= i:
+                self.write_node(point, "I", datainfo.y[i],
+                                {'unit': datainfo.y_unit})
+            if datainfo.dy != None and len(datainfo.dy) > i:
+                self.write_node(point, "Idev", datainfo.dy[i],
+                                {'unit': datainfo.y_unit})
+            if datainfo.dx != None and len(datainfo.dx) > i:
+                self.write_node(point, "Qdev", datainfo.dx[i],
+                                {'unit': datainfo.x_unit})
+            if datainfo.dxw != None and len(datainfo.dxw) > i:
+                self.write_node(point, "dQw", datainfo.dxw[i],
+                                {'unit': datainfo.x_unit})
+            if datainfo.dxl != None and len(datainfo.dxl) > i:
+                self.write_node(point, "dQl", datainfo.dxl[i],
+                                {'unit': datainfo.x_unit})
+    def _write_trans_spectrum(self, datainfo, entry_node):
+        """
+        Writes the transmission spectrum data to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        for i in range(len(datainfo.trans_spectrum)):
+            spectrum = datainfo.trans_spectrum[i]
+            node = self.create_element("SAStransmission_spectrum",
+                                       {"name" : spectrum.name})
+            self.append(node, entry_node)
+            if isinstance(spectrum.timestamp, datetime.datetime):
+                node.setAttribute("timestamp", spectrum.timestamp)
+            for i in range(len(spectrum.wavelength)):
+                point = self.create_element("Tdata")
+                node.append(point)
+                self.write_node(point, "Lambda", spectrum.wavelength[i],
+                                {'unit': spectrum.wavelength_unit})
+                self.write_node(point, "T", spectrum.transmission[i],
+                                {'unit': spectrum.transmission_unit})
+                if spectrum.transmission_deviation != None \
+                and len(spectrum.transmission_deviation) >= i:
+                    self.write_node(point, "Tdev",
+                                    spectrum.transmission_deviation[i],
+                                    {'unit':
+                                     spectrum.transmission_deviation_unit})
+    def _write_sample_info(self, datainfo, entry_node):
+        """
+        Writes the sample information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        sample = self.create_element("SASsample")
+        if datainfo.sample.name is not None:
+            self.write_attribute(sample, "name",
+                                 str(datainfo.sample.name))
+        self.append(sample, entry_node)
+        self.write_node(sample, "ID", str(datainfo.sample.ID))
+        self.write_node(sample, "thickness", datainfo.sample.thickness,
+                        {"unit": datainfo.sample.thickness_unit})
+        self.write_node(sample, "transmission", datainfo.sample.transmission)
+        self.write_node(sample, "temperature", datainfo.sample.temperature,
+                        {"unit": datainfo.sample.temperature_unit})
+        pos = self.create_element("position")
+        written = self.write_node(pos,
+                                  "x",
+                                  datainfo.sample.position.x,
+                                  {"unit": datainfo.sample.position_unit})
+        written = written | self.write_node( \
+            pos, "y", datainfo.sample.position.y,
+            {"unit": datainfo.sample.position_unit})
+        written = written | self.write_node( \
+            pos, "z", datainfo.sample.position.z,
+            {"unit": datainfo.sample.position_unit})
+        if written == True:
+            self.append(pos, sample)
+        ori = self.create_element("orientation")
+        written = self.write_node(ori, "roll",
+                                  datainfo.sample.orientation.x,
+                                  {"unit": datainfo.sample.orientation_unit})
+        written = written | self.write_node( \
+            ori, "pitch", datainfo.sample.orientation.y,
+            {"unit": datainfo.sample.orientation_unit})
+        written = written | self.write_node( \
+            ori, "yaw", datainfo.sample.orientation.z,
+            {"unit": datainfo.sample.orientation_unit})
+        if written == True:
+            self.append(ori, sample)
+        for item in datainfo.sample.details:
+            self.write_node(sample, "details", item)
+    def _write_instrument(self, datainfo, entry_node):
+        """
+        Writes the instrumental information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        instr = self.create_element("SASinstrument")
+        self.append(instr, entry_node)
+        self.write_node(instr, "name", datainfo.instrument)
+        return instr
+    def _write_source(self, datainfo, instr):
+        """
+        Writes the source information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param instr: instrument node  to be appended to
+        """
+        source = self.create_element("SASsource")
+        if datainfo.source.name is not None:
+            self.write_attribute(source, "name",
+                                 str(datainfo.source.name))
+        self.append(source, instr)
+        if datainfo.source.radiation == None or datainfo.source.radiation == '':
+            datainfo.source.radiation = "neutron"
+        self.write_node(source, "radiation", datainfo.source.radiation)
+        size = self.create_element("beam_size")
+        if datainfo.source.beam_size_name is not None:
+            self.write_attribute(size, "name",
+                                 str(datainfo.source.beam_size_name))
+        written = self.write_node( \
+            size, "x", datainfo.source.beam_size.x,
+            {"unit": datainfo.source.beam_size_unit})
+        written = written | self.write_node( \
+            size, "y", datainfo.source.beam_size.y,
+            {"unit": datainfo.source.beam_size_unit})
+        written = written | self.write_node( \
+            size, "z", datainfo.source.beam_size.z,
+            {"unit": datainfo.source.beam_size_unit})
+        if written == True:
+            self.append(size, source)
+        self.write_node(source, "beam_shape", datainfo.source.beam_shape)
+        self.write_node(source, "wavelength",
+                        datainfo.source.wavelength,
+                        {"unit": datainfo.source.wavelength_unit})
+        self.write_node(source, "wavelength_min",
+                        datainfo.source.wavelength_min,
+                        {"unit": datainfo.source.wavelength_min_unit})
+        self.write_node(source, "wavelength_max",
+                        datainfo.source.wavelength_max,
+                        {"unit": datainfo.source.wavelength_max_unit})
+        self.write_node(source, "wavelength_spread",
+                        datainfo.source.wavelength_spread,
+                        {"unit": datainfo.source.wavelength_spread_unit})
+    def _write_collimation(self, datainfo, instr):
+        """
+        Writes the collimation information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param instr: lxml node ElementTree object to be appended to
+        """
+        if datainfo.collimation == [] or datainfo.collimation == None:
+            coll = Collimation()
+            datainfo.collimation.append(coll)
+        for item in datainfo.collimation:
+            coll = self.create_element("SAScollimation")
+            if item.name is not None:
+                self.write_attribute(coll, "name", str(item.name))
+            self.append(coll, instr)
+            self.write_node(coll, "length", item.length,
+                            {"unit": item.length_unit})
+            for aperture in item.aperture:
+                apert = self.create_element("aperture")
+                if aperture.name is not None:
+                    self.write_attribute(apert, "name", str(aperture.name))
+                if aperture.type is not None:
+                    self.write_attribute(apert, "type", str(aperture.type))
+                self.append(apert, coll)
+                size = self.create_element("size")
+                if aperture.size_name is not None:
+                    self.write_attribute(size, "name",
+                                         str(aperture.size_name))
+                written = self.write_node(size, "x", aperture.size.x,
+                                          {"unit": aperture.size_unit})
+                written = written | self.write_node( \
+                    size, "y", aperture.size.y,
+                    {"unit": aperture.size_unit})
+                written = written | self.write_node( \
+                    size, "z", aperture.size.z,
+                    {"unit": aperture.size_unit})
+                if written == True:
+                    self.append(size, apert)
+                self.write_node(apert, "distance", aperture.distance,
+                                {"unit": aperture.distance_unit})
+    def _write_detectors(self, datainfo, instr):
+        """
+        Writes the detector information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param inst: lxml instrument node to be appended to
+        """
+        if datainfo.detector == None or datainfo.detector == []:
+            det = Detector()
+            det.name = ""
+            datainfo.detector.append(det)
+        for item in datainfo.detector:
+            det = self.create_element("SASdetector")
+            written = self.write_node(det, "name", item.name)
+            written = written | self.write_node(det, "SDD", item.distance,
+                                                {"unit": item.distance_unit})
+            if written == True:
+                self.append(det, instr)
+            off = self.create_element("offset")
+            written = self.write_node(off, "x", item.offset.x,
+                                      {"unit": item.offset_unit})
+            written = written | self.write_node(off, "y", item.offset.y,
+                                                {"unit": item.offset_unit})
+            written = written | self.write_node(off, "z", item.offset.z,
+                                                {"unit": item.offset_unit})
+            if written == True:
+                self.append(off, det)
+            ori = self.create_element("orientation")
+            written = self.write_node(ori, "roll", item.orientation.x,
+                                      {"unit": item.orientation_unit})
+            written = written | self.write_node(ori, "pitch",
+                                                item.orientation.y,
+                                                {"unit": item.orientation_unit})
+            written = written | self.write_node(ori, "yaw",
+                                                item.orientation.z,
+                                                {"unit": item.orientation_unit})
+            if written == True:
+                self.append(ori, det)
+            center = self.create_element("beam_center")
+            written = self.write_node(center, "x", item.beam_center.x,
+                                      {"unit": item.beam_center_unit})
+            written = written | self.write_node(center, "y",
+                                                item.beam_center.y,
+                                                {"unit": item.beam_center_unit})
+            written = written | self.write_node(center, "z",
+                                                item.beam_center.z,
+                                                {"unit": item.beam_center_unit})
+            if written == True:
+                self.append(center, det)
+            pix = self.create_element("pixel_size")
+            written = self.write_node(pix, "x", item.pixel_size.x,
+                                      {"unit": item.pixel_size_unit})
+            written = written | self.write_node(pix, "y", item.pixel_size.y,
+                                                {"unit": item.pixel_size_unit})
+            written = written | self.write_node(pix, "z", item.pixel_size.z,
+                                                {"unit": item.pixel_size_unit})
+            written = written | self.write_node(det, "slit_length",
+                                                item.slit_length,
+                                                {"unit": item.slit_length_unit})
+            if written == True:
+                self.append(pix, det)
+    def _write_process_notes(self, datainfo, entry_node):
+        """
+        Writes the process notes to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        for item in datainfo.process:
+            node = self.create_element("SASprocess")
+            self.append(node, entry_node)
+            self.write_node(node, "name", item.name)
+            self.write_node(node, "date", item.date)
+            self.write_node(node, "description", item.description)
+            for term in item.term:
+                value = term['value']
+                del term['value']
+                self.write_node(node, "term", value, term)
+            for note in item.notes:
+                self.write_node(node, "SASprocessnote", note)
+            if len(item.notes) == 0:
+                self.write_node(node, "SASprocessnote", "")
+    def _write_notes(self, datainfo, entry_node):
+        """
+        Writes the notes to the XML file and creates an empty note if none
+        exist
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        if len(datainfo.notes) == 0:
+            node = self.create_element("SASnote")
+            self.append(node, entry_node)
+        else:
+            for item in datainfo.notes:
+                node = self.create_element("SASnote")
+                self.write_text(node, item)
+                self.append(node, entry_node)
+    def _check_origin(self, entry_node, doc, frm):
+        """
+        Return the document, and the SASentry node associated with
+        the data we just wrote.
+        If the calling function was not the cansas reader, return a minidom
+        object rather than an lxml object.
+        :param entry_node: lxml node ElementTree object to be appended to
+        :param doc: entire xml tree
+        """
+        if not frm:
+            frm = inspect.stack()[1]
+        mod_name = frm[1].replace("\\", "/").replace(".pyc", "")
+        mod_name = mod_name.replace(".py", "")
+        mod = mod_name.split("sas/")
+        mod_name = mod[1]
+        if mod_name != "sascalc/dataloader/readers/cansas_reader":
+            string = self.to_string(doc, pretty_print=False)
+            doc = parseString(string)
+            node_name = entry_node.tag
+            node_list = doc.getElementsByTagName(node_name)
+            entry_node = node_list.item(0)
+        return doc, entry_node
+        if self.current_dataset.dxl is not None:
+            dql_exists = True
+        if self.current_dataset.dxw is not None:
+            dqw_exists = True
+        if self.current_dataset.dx is not None:
+            dq_exists = True
+        if self.current_dataset.dy is not None:
+            di_exists = True
+        if dqw_exists and not dql_exists:
+            array_size = self.current_dataset.dxw.size - 1
+            self.current_dataset.dxl = np.append(self.current_dataset.dxl, np.zeros([array_size]))
+        elif dql_exists and not dqw_exists:
+            array_size = self.current_dataset.dxl.size - 1
+            self.current_dataset.dxw = np.append(self.current_dataset.dxw, np.zeros([array_size]))
+        elif not dql_exists and not dqw_exists and not dq_exists:
+            array_size = self.current_dataset.x.size - 1
+            self.current_dataset.dx = np.append(self.current_dataset.dx, np.zeros([array_size]))
+        if not di_exists:
+            array_size = self.current_dataset.y.size - 1
+            self.current_dataset.dy = np.append(self.current_dataset.dy, np.zeros([array_size]))
+    ####### All methods below are for writing CanSAS XML files #######
+    def write(self, filename, datainfo):
+        """
+        Write the content of a Data1D as a CanSAS XML file
+        :param filename: name of the file to write
+        :param datainfo: Data1D object
+        """
+        # Create XML document
+        doc, _ = self._to_xml_doc(datainfo)
+        # Write the file
+        file_ref = open(filename, 'w')
+        if self.encoding == None:
+            self.encoding = "UTF-8"
+        doc.write(file_ref, encoding=self.encoding,
+                  pretty_print=True, xml_declaration=True)
+        file_ref.close()
     def _to_xml_doc(self, datainfo):
 …
         return False
+    def write(self, filename, datainfo):
+        """
+        Write the content of a Data1D as a CanSAS XML file
+        :param filename: name of the file to write
+        :param datainfo: Data1D object
+        """
+        # Create XML document
+        doc, _ = self._to_xml_doc(datainfo)
+        # Write the file
+        file_ref = open(filename, 'w')
+        if self.encoding == None:
+            self.encoding = "UTF-8"
+        doc.write(file_ref, encoding=self.encoding,
+                  pretty_print=True, xml_declaration=True)
+        file_ref.close()
+    def _get_pi_string(self):
+        """
+        Creates the processing instructions header for writing to file
+        """
+        pis = self.return_processing_instructions()
+        if len(pis) > 0:
+            pi_tree = self.create_tree(pis[0])
+            i = 1
+            for i in range(1, len(pis) - 1):
+                pi_tree = self.append(pis[i], pi_tree)
+            pi_string = self.to_string(pi_tree)
+        else:
+            pi_string = ""
+        return pi_string
+    def _create_main_node(self):
+        """
+        Creates the primary xml header used when writing to file
+        """
+        xsi = "http://www.w3.org/2001/XMLSchema-instance"
+        version = self.cansas_version
+        n_s = CANSAS_NS.get(version).get("ns")
+        if version == "1.1":
+            url = "http://www.cansas.org/formats/1.1/"
+        else:
+            url = "http://svn.smallangles.net/svn/canSAS/1dwg/trunk/"
+        schema_location = "{0} {1}cansas1d.xsd".format(n_s, url)
+        attrib = {"{" + xsi + "}schemaLocation" : schema_location,
+                  "version" : version}
+        nsmap = {'xsi' : xsi, None: n_s}
+        main_node = self.create_element("{" + n_s + "}SASroot",
+                                        attrib=attrib, nsmap=nsmap)
+        return main_node
+    def _write_run_names(self, datainfo, entry_node):
+        """
+        Writes the run names to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        if datainfo.run == None or datainfo.run == []:
+            datainfo.run.append(RUN_NAME_DEFAULT)
+            datainfo.run_name[RUN_NAME_DEFAULT] = RUN_NAME_DEFAULT
+        for item in datainfo.run:
+            runname = {}
+            if item in datainfo.run_name and \
+            len(str(datainfo.run_name[item])) > 1:
+                runname = {'name': datainfo.run_name[item]}
+            self.write_node(entry_node, "Run", item, runname)
+    def _write_data(self, datainfo, entry_node):
+        """
+        Writes the I and Q data to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        node = self.create_element("SASdata")
+        self.append(node, entry_node)
+        for i in range(len(datainfo.x)):
+            point = self.create_element("Idata")
+            node.append(point)
+            self.write_node(point, "Q", datainfo.x[i],
+                            {'unit': datainfo.x_unit})
+            if len(datainfo.y) >= i:
+                self.write_node(point, "I", datainfo.y[i],
+                                {'unit': datainfo.y_unit})
+            if datainfo.dy != None and len(datainfo.dy) > i:
+                self.write_node(point, "Idev", datainfo.dy[i],
+                                {'unit': datainfo.y_unit})
+            if datainfo.dx != None and len(datainfo.dx) > i:
+                self.write_node(point, "Qdev", datainfo.dx[i],
+                                {'unit': datainfo.x_unit})
+            if datainfo.dxw != None and len(datainfo.dxw) > i:
+                self.write_node(point, "dQw", datainfo.dxw[i],
+                                {'unit': datainfo.x_unit})
+            if datainfo.dxl != None and len(datainfo.dxl) > i:
+                self.write_node(point, "dQl", datainfo.dxl[i],
+                                {'unit': datainfo.x_unit})
+    def _write_trans_spectrum(self, datainfo, entry_node):
+        """
+        Writes the transmission spectrum data to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        for i in range(len(datainfo.trans_spectrum)):
+            spectrum = datainfo.trans_spectrum[i]
+            node = self.create_element("SAStransmission_spectrum",
+                                       {"name" : spectrum.name})
+            self.append(node, entry_node)
+            if isinstance(spectrum.timestamp, datetime.datetime):
+                node.setAttribute("timestamp", spectrum.timestamp)
+            for i in range(len(spectrum.wavelength)):
+                point = self.create_element("Tdata")
+                node.append(point)
+                self.write_node(point, "Lambda", spectrum.wavelength[i],
+                                {'unit': spectrum.wavelength_unit})
+                self.write_node(point, "T", spectrum.transmission[i],
+                                {'unit': spectrum.transmission_unit})
+                if spectrum.transmission_deviation != None \
+                and len(spectrum.transmission_deviation) >= i:
+                    self.write_node(point, "Tdev",
+                                    spectrum.transmission_deviation[i],
+                                    {'unit':
+                                     spectrum.transmission_deviation_unit})
+    def _write_sample_info(self, datainfo, entry_node):
+        """
+        Writes the sample information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        sample = self.create_element("SASsample")
+        if datainfo.sample.name is not None:
+            self.write_attribute(sample, "name",
+                                 str(datainfo.sample.name))
+        self.append(sample, entry_node)
+        self.write_node(sample, "ID", str(datainfo.sample.ID))
+        self.write_node(sample, "thickness", datainfo.sample.thickness,
+                        {"unit": datainfo.sample.thickness_unit})
+        self.write_node(sample, "transmission", datainfo.sample.transmission)
+        self.write_node(sample, "temperature", datainfo.sample.temperature,
+                        {"unit": datainfo.sample.temperature_unit})
+        pos = self.create_element("position")
+        written = self.write_node(pos,
+                                  "x",
+                                  datainfo.sample.position.x,
+                                  {"unit": datainfo.sample.position_unit})
+        written = written | self.write_node( \
+            pos, "y", datainfo.sample.position.y,
+            {"unit": datainfo.sample.position_unit})
+        written = written | self.write_node( \
+            pos, "z", datainfo.sample.position.z,
+            {"unit": datainfo.sample.position_unit})
+        if written == True:
+            self.append(pos, sample)
+        ori = self.create_element("orientation")
+        written = self.write_node(ori, "roll",
+                                  datainfo.sample.orientation.x,
+                                  {"unit": datainfo.sample.orientation_unit})
+        written = written | self.write_node( \
+            ori, "pitch", datainfo.sample.orientation.y,
+            {"unit": datainfo.sample.orientation_unit})
+        written = written | self.write_node( \
+            ori, "yaw", datainfo.sample.orientation.z,
+            {"unit": datainfo.sample.orientation_unit})
+        if written == True:
+            self.append(ori, sample)
+        for item in datainfo.sample.details:
+            self.write_node(sample, "details", item)
+    def _write_instrument(self, datainfo, entry_node):
+        """
+        Writes the instrumental information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        instr = self.create_element("SASinstrument")
+        self.append(instr, entry_node)
+        self.write_node(instr, "name", datainfo.instrument)
+        return instr
+    def _write_source(self, datainfo, instr):
+        """
+        Writes the source information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param instr: instrument node  to be appended to
+        """
+        source = self.create_element("SASsource")
+        if datainfo.source.name is not None:
+            self.write_attribute(source, "name",
+                                 str(datainfo.source.name))
+        self.append(source, instr)
+        if datainfo.source.radiation == None or datainfo.source.radiation == '':
+            datainfo.source.radiation = "neutron"
+        self.write_node(source, "radiation", datainfo.source.radiation)
+        size = self.create_element("beam_size")
+        if datainfo.source.beam_size_name is not None:
+            self.write_attribute(size, "name",
+                                 str(datainfo.source.beam_size_name))
+        written = self.write_node( \
+            size, "x", datainfo.source.beam_size.x,
+            {"unit": datainfo.source.beam_size_unit})
+        written = written | self.write_node( \
+            size, "y", datainfo.source.beam_size.y,
+            {"unit": datainfo.source.beam_size_unit})
+        written = written | self.write_node( \
+            size, "z", datainfo.source.beam_size.z,
+            {"unit": datainfo.source.beam_size_unit})
+        if written == True:
+            self.append(size, source)
+        self.write_node(source, "beam_shape", datainfo.source.beam_shape)
+        self.write_node(source, "wavelength",
+                        datainfo.source.wavelength,
+                        {"unit": datainfo.source.wavelength_unit})
+        self.write_node(source, "wavelength_min",
+                        datainfo.source.wavelength_min,
+                        {"unit": datainfo.source.wavelength_min_unit})
+        self.write_node(source, "wavelength_max",
+                        datainfo.source.wavelength_max,
+                        {"unit": datainfo.source.wavelength_max_unit})
+        self.write_node(source, "wavelength_spread",
+                        datainfo.source.wavelength_spread,
+                        {"unit": datainfo.source.wavelength_spread_unit})
+    def _write_collimation(self, datainfo, instr):
+        """
+        Writes the collimation information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param instr: lxml node ElementTree object to be appended to
+        """
+        if datainfo.collimation == [] or datainfo.collimation == None:
+            coll = Collimation()
+            datainfo.collimation.append(coll)
+        for item in datainfo.collimation:
+            coll = self.create_element("SAScollimation")
+            if item.name is not None:
+                self.write_attribute(coll, "name", str(item.name))
+            self.append(coll, instr)
+            self.write_node(coll, "length", item.length,
+                            {"unit": item.length_unit})
+            for aperture in item.aperture:
+                apert = self.create_element("aperture")
+                if aperture.name is not None:
+                    self.write_attribute(apert, "name", str(aperture.name))
+                if aperture.type is not None:
+                    self.write_attribute(apert, "type", str(aperture.type))
+                self.append(apert, coll)
+                size = self.create_element("size")
+                if aperture.size_name is not None:
+                    self.write_attribute(size, "name",
+                                         str(aperture.size_name))
+                written = self.write_node(size, "x", aperture.size.x,
+                                          {"unit": aperture.size_unit})
+                written = written | self.write_node( \
+                    size, "y", aperture.size.y,
+                    {"unit": aperture.size_unit})
+                written = written | self.write_node( \
+                    size, "z", aperture.size.z,
+                    {"unit": aperture.size_unit})
+                if written == True:
+                    self.append(size, apert)
+                self.write_node(apert, "distance", aperture.distance,
+                                {"unit": aperture.distance_unit})
+    def _write_detectors(self, datainfo, instr):
+        """
+        Writes the detector information to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param inst: lxml instrument node to be appended to
+        """
+        if datainfo.detector == None or datainfo.detector == []:
+            det = Detector()
+            det.name = ""
+            datainfo.detector.append(det)
+        for item in datainfo.detector:
+            det = self.create_element("SASdetector")
+            written = self.write_node(det, "name", item.name)
+            written = written | self.write_node(det, "SDD", item.distance,
+                                                {"unit": item.distance_unit})
+            if written == True:
+                self.append(det, instr)
+            off = self.create_element("offset")
+            written = self.write_node(off, "x", item.offset.x,
+                                      {"unit": item.offset_unit})
+            written = written | self.write_node(off, "y", item.offset.y,
+                                                {"unit": item.offset_unit})
+            written = written | self.write_node(off, "z", item.offset.z,
+                                                {"unit": item.offset_unit})
+            if written == True:
+                self.append(off, det)
+            ori = self.create_element("orientation")
+            written = self.write_node(ori, "roll", item.orientation.x,
+                                      {"unit": item.orientation_unit})
+            written = written | self.write_node(ori, "pitch",
+                                                item.orientation.y,
+                                                {"unit": item.orientation_unit})
+            written = written | self.write_node(ori, "yaw",
+                                                item.orientation.z,
+                                                {"unit": item.orientation_unit})
+            if written == True:
+                self.append(ori, det)
+            center = self.create_element("beam_center")
+            written = self.write_node(center, "x", item.beam_center.x,
+                                      {"unit": item.beam_center_unit})
+            written = written | self.write_node(center, "y",
+                                                item.beam_center.y,
+                                                {"unit": item.beam_center_unit})
+            written = written | self.write_node(center, "z",
+                                                item.beam_center.z,
+                                                {"unit": item.beam_center_unit})
+            if written == True:
+                self.append(center, det)
+            pix = self.create_element("pixel_size")
+            written = self.write_node(pix, "x", item.pixel_size.x,
+                                      {"unit": item.pixel_size_unit})
+            written = written | self.write_node(pix, "y", item.pixel_size.y,
+                                                {"unit": item.pixel_size_unit})
+            written = written | self.write_node(pix, "z", item.pixel_size.z,
+                                                {"unit": item.pixel_size_unit})
+            written = written | self.write_node(det, "slit_length",
+                                                item.slit_length,
+                                                {"unit": item.slit_length_unit})
+            if written == True:
+                self.append(pix, det)
+    def _write_process_notes(self, datainfo, entry_node):
+        """
+        Writes the process notes to the XML file
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        for item in datainfo.process:
+            node = self.create_element("SASprocess")
+            self.append(node, entry_node)
+            self.write_node(node, "name", item.name)
+            self.write_node(node, "date", item.date)
+            self.write_node(node, "description", item.description)
+            for term in item.term:
+                value = term['value']
+                del term['value']
+                self.write_node(node, "term", value, term)
+            for note in item.notes:
+                self.write_node(node, "SASprocessnote", note)
+            if len(item.notes) == 0:
+                self.write_node(node, "SASprocessnote", "")
+    def _write_notes(self, datainfo, entry_node):
+        """
+        Writes the notes to the XML file and creates an empty note if none
+        exist
+        :param datainfo: The Data1D object the information is coming from
+        :param entry_node: lxml node ElementTree object to be appended to
+        """
+        if len(datainfo.notes) == 0:
+            node = self.create_element("SASnote")
+            self.append(node, entry_node)
+        else:
+            for item in datainfo.notes:
+                node = self.create_element("SASnote")
+                self.write_text(node, item)
+                self.append(node, entry_node)
+    def _check_origin(self, entry_node, doc, frm):
+        """
+        Return the document, and the SASentry node associated with
+        the data we just wrote.
+        If the calling function was not the cansas reader, return a minidom
+        object rather than an lxml object.
+        :param entry_node: lxml node ElementTree object to be appended to
+        :param doc: entire xml tree
+        """
+        if not frm:
+            frm = inspect.stack()[1]
+        mod_name = frm[1].replace("\\", "/").replace(".pyc", "")
+        mod_name = mod_name.replace(".py", "")
+        mod = mod_name.split("sas/")
+        mod_name = mod[1]
+        if mod_name != "sascalc/dataloader/readers/cansas_reader":
+            string = self.to_string(doc, pretty_print=False)
+            doc = parseString(string)
+            node_name = entry_node.tag
+            node_list = doc.getElementsByTagName(node_name)
+            entry_node = node_list.item(0)
+        return doc, entry_node
     # DO NOT REMOVE - used in saving and loading panel states.
 …
         if entry is not None and entry.text is not None:
             exec "storage.%s = entry.text.strip()" % variable
+# DO NOT REMOVE Called by outside packages:
+#    sas.sasgui.perspectives.invariant.invariant_state
+#    sas.sasgui.perspectives.fitting.pagestate
+def get_content(location, node):
+    """
+    Get the first instance of the content of a xpath location.
+    :param location: xpath location
+    :param node: node to start at
+    :return: Element, or None
+    """
+    nodes = node.xpath(location,
+                       namespaces={'ns': CANSAS_NS.get("1.0").get("ns")})
+    if len(nodes) > 0:
+        return nodes[0]
+    else:
+        return None
+# DO NOT REMOVE Called by outside packages:
+#    sas.sasgui.perspectives.fitting.pagestate
+def write_node(doc, parent, name, value, attr=None):
+    """
+    :param doc: document DOM
+    :param parent: parent node
+    :param name: tag of the element
+    :param value: value of the child text node
+    :param attr: attribute dictionary
+    :return: True if something was appended, otherwise False
+    """
+    if attr is None:
+        attr = {}
+    if value is not None:
+        node = doc.createElement(name)
+        node.appendChild(doc.createTextNode(str(value)))
+        for item in attr:
+            node.setAttribute(item, attr[item])
+        parent.appendChild(node)
+        return True
+    return False

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SasView

Changeset a40be8c in sasview for src/sas/sascalc/dataloader/readers/cansas_reader.py

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src/sas/sascalc/dataloader/readers/cansas_reader.py

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