Index: test/fileconverter/test/cansas1d.xml
===================================================================
--- test/fileconverter/test/cansas1d.xml	(revision c476457a8268dc70465327ac7898306c6c214bb4)
+++ test/fileconverter/test/cansas1d.xml	(revision dcb91cf83e474bdbe1c788d87690ca5f5e7841cb)
@@ -26,4 +26,28 @@
 				<Shadowfactor><!-- Shadowfactor is optional --></Shadowfactor>
 			</Idata>
+      <Idata>
+				<Q unit="1/A">0.04</Q>
+				<I unit="1/cm">1002</I>
+				<Idev unit="1/cm">4</Idev>
+				<Qdev unit="1/A">0.02</Qdev>
+				<Qmean unit="1/A"><!-- Qmean is optional --></Qmean>
+				<Shadowfactor><!-- Shadowfactor is optional --></Shadowfactor>
+			</Idata>
+      <Idata>
+				<Q unit="1/A">0.05</Q>
+				<I unit="1/cm">1003</I>
+				<Idev unit="1/cm">4</Idev>
+				<Qdev unit="1/A">0.02</Qdev>
+				<Qmean unit="1/A"><!-- Qmean is optional --></Qmean>
+				<Shadowfactor><!-- Shadowfactor is optional --></Shadowfactor>
+			</Idata>
+      <Idata>
+				<Q unit="1/A">0.06</Q>
+				<I unit="1/cm">1004</I>
+				<Idev unit="1/cm">4</Idev>
+				<Qdev unit="1/A">0.02</Qdev>
+				<Qmean unit="1/A"><!-- Qmean is optional --></Qmean>
+				<Shadowfactor><!-- Shadowfactor is optional --></Shadowfactor>
+			</Idata>
 		</SASdata>
 		<SASsample name='my sample'>
@@ -47,5 +71,5 @@
 				Some text here
 			</details>
-			
+
 		</SASsample>
 		<SASinstrument>
Index: test/sasdataloader/test/utest_extension_registry.py
===================================================================
--- test/sasdataloader/test/utest_extension_registry.py	(revision dcb91cf83e474bdbe1c788d87690ca5f5e7841cb)
+++ test/sasdataloader/test/utest_extension_registry.py	(revision dcb91cf83e474bdbe1c788d87690ca5f5e7841cb)
@@ -0,0 +1,78 @@
+"""
+    Unit tests for loading data files using the extension registry
+"""
+
+import logging
+import unittest
+import os
+import shutil
+import numpy as np
+
+from sas.sascalc.dataloader.loader import Registry as Loader
+
+logger = logging.getLogger(__name__)
+
+class ExtensionRegistryTests(unittest.TestCase):
+
+    def setUp(self):
+        self.valid_file = "valid_cansas_xml.xml"
+        self.valid_file_wrong_known_ext = "valid_cansas_xml.txt"
+        self.valid_file_wrong_unknown_ext = "valid_cansas_xml.xyz"
+        shutil.copyfile(self.valid_file, self.valid_file_wrong_known_ext)
+        shutil.copyfile(self.valid_file, self.valid_file_wrong_unknown_ext)
+        self.invalid_file = "cansas1d_notitle.xml"
+
+        self.loader = Loader()
+
+    def test_wrong_known_ext(self):
+        """
+        Load a valid CanSAS XML file that has the extension '.txt', which is in
+        the extension registry. Compare the results to loading the same file
+        with the extension '.xml'
+        """
+        correct = self.loader.load(self.valid_file)
+        wrong_ext = self.loader.load(self.valid_file_wrong_known_ext)
+        self.assertEqual(len(correct), 1)
+        self.assertEqual(len(wrong_ext), 1)
+        correct = correct[0]
+        wrong_ext = wrong_ext[0]
+
+        self.assertTrue(np.all(correct.x == wrong_ext.x))
+        self.assertTrue(np.all(correct.y == wrong_ext.y))
+        self.assertTrue(np.all(correct.dy == wrong_ext.dy))
+
+    def test_wrong_unknown_ext(self):
+        """
+        Load a valid CanSAS XML file that has the extension '.xyz', which isn't
+        in the extension registry. Compare the results to loading the same file
+        with the extension '.xml'
+        """
+        correct = self.loader.load(self.valid_file)
+        wrong_ext = self.loader.load(self.valid_file_wrong_unknown_ext)
+        self.assertEqual(len(correct), 1)
+        self.assertEqual(len(wrong_ext), 1)
+        correct = correct[0]
+        wrong_ext = wrong_ext[0]
+
+        self.assertTrue(np.all(correct.x == wrong_ext.x))
+        self.assertTrue(np.all(correct.y == wrong_ext.y))
+        self.assertTrue(np.all(correct.dy == wrong_ext.dy))
+
+    def test_data_reader_exception(self):
+        """
+        Load a CanSAS XML file that doesn't meet the schema, and check errors
+        are set correctly
+        """
+        data = self.loader.load(self.invalid_file)
+        self.assertEqual(len(data), 1)
+        data = data[0]
+        self.assertEqual(len(data.errors), 1)
+
+        err_msg = data.errors[0]
+        self.assertTrue("does not fully meet the CanSAS v1.x specification" in err_msg)
+
+    def tearDown(self):
+        if os.path.isfile(self.valid_file_wrong_known_ext):
+            os.remove(self.valid_file_wrong_known_ext)
+        if os.path.isfile(self.valid_file_wrong_unknown_ext):
+            os.remove(self.valid_file_wrong_unknown_ext)
Index: test/sasdataloader/test/valid_cansas_xml.xml
===================================================================
--- test/sasdataloader/test/valid_cansas_xml.xml	(revision dcb91cf83e474bdbe1c788d87690ca5f5e7841cb)
+++ test/sasdataloader/test/valid_cansas_xml.xml	(revision dcb91cf83e474bdbe1c788d87690ca5f5e7841cb)
@@ -0,0 +1,235 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/xsl" href="cansas1d.xsl" ?>
+<SASroot version="1.1"
+		 xmlns="urn:cansas1d:1.1"
+		 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="urn:cansas1d:1.1 http://www.cansas.org/formats/1.1/cansas1d.xsd"
+		>
+	<SASentry name="80514main_1D_2.2_10.0">
+		<Title>LOQ_Standard_TK49_SANS</Title>
+		<Run>80514</Run>
+		<SASdata>
+			<Idata><Q unit="1/A">0.009</Q><I unit="1/cm">64.9826</I><Idev unit="1/cm">0.905127</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.011</Q><I unit="1/cm">60.4976</I><Idev unit="1/cm">0.578505</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.013</Q><I unit="1/cm">54.1897</I><Idev unit="1/cm">0.454188</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.015</Q><I unit="1/cm">48.6809</I><Idev unit="1/cm">0.364523</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.017</Q><I unit="1/cm">44.8318</I><Idev unit="1/cm">0.308029</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.019</Q><I unit="1/cm">40.5013</I><Idev unit="1/cm">0.2639</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.021</Q><I unit="1/cm">36.7962</I><Idev unit="1/cm">0.231793</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.023</Q><I unit="1/cm">32.6821</I><Idev unit="1/cm">0.20405</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.025</Q><I unit="1/cm">29.5921</I><Idev unit="1/cm">0.182531</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.027</Q><I unit="1/cm">26.5953</I><Idev unit="1/cm">0.166084</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.029</Q><I unit="1/cm">23.8601</I><Idev unit="1/cm">0.150391</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.031</Q><I unit="1/cm">21.5832</I><Idev unit="1/cm">0.138395</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.033</Q><I unit="1/cm">19.5318</I><Idev unit="1/cm">0.128068</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.035</Q><I unit="1/cm">17.6629</I><Idev unit="1/cm">0.118684</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.037</Q><I unit="1/cm">16.1053</I><Idev unit="1/cm">0.109962</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.039</Q><I unit="1/cm">14.8859</I><Idev unit="1/cm">0.103403</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.041</Q><I unit="1/cm">13.5159</I><Idev unit="1/cm">0.0961741</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.043</Q><I unit="1/cm">12.5259</I><Idev unit="1/cm">0.0906122</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.045</Q><I unit="1/cm">11.6588</I><Idev unit="1/cm">0.0856667</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.047</Q><I unit="1/cm">10.7763</I><Idev unit="1/cm">0.0807006</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.049</Q><I unit="1/cm">9.96176</I><Idev unit="1/cm">0.0762889</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.051</Q><I unit="1/cm">9.25711</I><Idev unit="1/cm">0.0725919</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.053</Q><I unit="1/cm">8.60444</I><Idev unit="1/cm">0.0687657</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.055</Q><I unit="1/cm">7.95649</I><Idev unit="1/cm">0.0657415</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.057</Q><I unit="1/cm">7.45141</I><Idev unit="1/cm">0.0629965</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.059</Q><I unit="1/cm">7.00923</I><Idev unit="1/cm">0.0608427</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.061</Q><I unit="1/cm">6.53752</I><Idev unit="1/cm">0.0585451</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.063</Q><I unit="1/cm">6.1784</I><Idev unit="1/cm">0.0568321</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.065</Q><I unit="1/cm">5.86359</I><Idev unit="1/cm">0.0551602</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.067</Q><I unit="1/cm">5.49503</I><Idev unit="1/cm">0.0536499</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.069</Q><I unit="1/cm">5.16491</I><Idev unit="1/cm">0.0519884</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.071</Q><I unit="1/cm">4.93517</I><Idev unit="1/cm">0.0511581</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.073</Q><I unit="1/cm">4.65329</I><Idev unit="1/cm">0.0498001</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.075</Q><I unit="1/cm">4.38167</I><Idev unit="1/cm">0.0491524</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.077</Q><I unit="1/cm">4.22283</I><Idev unit="1/cm">0.0482002</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.079</Q><I unit="1/cm">4.01814</I><Idev unit="1/cm">0.0473281</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.081</Q><I unit="1/cm">3.78461</I><Idev unit="1/cm">0.0464861</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.083</Q><I unit="1/cm">3.66048</I><Idev unit="1/cm">0.0464159</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.085</Q><I unit="1/cm">3.45005</I><Idev unit="1/cm">0.045493</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.087</Q><I unit="1/cm">3.35223</I><Idev unit="1/cm">0.0449619</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.089</Q><I unit="1/cm">3.10616</I><Idev unit="1/cm">0.0444824</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.091</Q><I unit="1/cm">3.0392</I><Idev unit="1/cm">0.0437026</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.093</Q><I unit="1/cm">2.95856</I><Idev unit="1/cm">0.0433029</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.095</Q><I unit="1/cm">2.81081</I><Idev unit="1/cm">0.042632</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.097</Q><I unit="1/cm">2.67289</I><Idev unit="1/cm">0.0415106</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.099</Q><I unit="1/cm">2.58561</I><Idev unit="1/cm">0.0412882</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.101</Q><I unit="1/cm">2.50371</I><Idev unit="1/cm">0.0404051</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.103</Q><I unit="1/cm">2.39627</I><Idev unit="1/cm">0.0398555</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.105</Q><I unit="1/cm">2.24492</I><Idev unit="1/cm">0.0390938</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.107</Q><I unit="1/cm">2.19464</I><Idev unit="1/cm">0.0384002</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.109</Q><I unit="1/cm">2.19637</I><Idev unit="1/cm">0.0388099</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.111</Q><I unit="1/cm">2.05888</I><Idev unit="1/cm">0.0377362</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.113</Q><I unit="1/cm">2.04408</I><Idev unit="1/cm">0.0377554</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.115</Q><I unit="1/cm">1.94516</I><Idev unit="1/cm">0.0370363</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.117</Q><I unit="1/cm">1.92445</I><Idev unit="1/cm">0.0369617</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.119</Q><I unit="1/cm">1.9255</I><Idev unit="1/cm">0.0370019</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.121</Q><I unit="1/cm">1.84373</I><Idev unit="1/cm">0.0367476</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.123</Q><I unit="1/cm">1.75694</I><Idev unit="1/cm">0.0359448</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.125</Q><I unit="1/cm">1.6457</I><Idev unit="1/cm">0.035417</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.127</Q><I unit="1/cm">1.64723</I><Idev unit="1/cm">0.0354827</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.129</Q><I unit="1/cm">1.53556</I><Idev unit="1/cm">0.0349992</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.131</Q><I unit="1/cm">1.51513</I><Idev unit="1/cm">0.0349601</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.133</Q><I unit="1/cm">1.52569</I><Idev unit="1/cm">0.0352407</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.135</Q><I unit="1/cm">1.50912</I><Idev unit="1/cm">0.0356513</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.137</Q><I unit="1/cm">1.44029</I><Idev unit="1/cm">0.0352689</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.139</Q><I unit="1/cm">1.37614</I><Idev unit="1/cm">0.0348496</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.141</Q><I unit="1/cm">1.33383</I><Idev unit="1/cm">0.0345791</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.143</Q><I unit="1/cm">1.28005</I><Idev unit="1/cm">0.0347426</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.145</Q><I unit="1/cm">1.28777</I><Idev unit="1/cm">0.0354245</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.147</Q><I unit="1/cm">1.30976</I><Idev unit="1/cm">0.0358637</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.149</Q><I unit="1/cm">1.26914</I><Idev unit="1/cm">0.0355474</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.151</Q><I unit="1/cm">1.19888</I><Idev unit="1/cm">0.0348475</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.153</Q><I unit="1/cm">1.14352</I><Idev unit="1/cm">0.0350899</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.155</Q><I unit="1/cm">1.13774</I><Idev unit="1/cm">0.0356449</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.157</Q><I unit="1/cm">1.0606</I><Idev unit="1/cm">0.0354117</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.159</Q><I unit="1/cm">1.13869</I><Idev unit="1/cm">0.0362195</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.161</Q><I unit="1/cm">1.0039</I><Idev unit="1/cm">0.034884</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.163</Q><I unit="1/cm">1.03345</I><Idev unit="1/cm">0.0361466</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.165</Q><I unit="1/cm">0.98678</I><Idev unit="1/cm">0.0358834</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.167</Q><I unit="1/cm">0.977719</I><Idev unit="1/cm">0.0361403</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.169</Q><I unit="1/cm">0.950819</I><Idev unit="1/cm">0.0370585</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.171</Q><I unit="1/cm">0.939584</I><Idev unit="1/cm">0.0366269</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.173</Q><I unit="1/cm">0.924348</I><Idev unit="1/cm">0.0370656</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.175</Q><I unit="1/cm">0.92587</I><Idev unit="1/cm">0.0385766</Idev><Qdev unit="1/A">0</Qdev></Idata>
+			<Idata><Q unit="1/A">0.177</Q><I unit="1/cm">0.871499</I><Idev unit="1/cm">0.0383615</Idev><Qdev unit="1/A">0</Qdev></Idata>
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+			<Idata><Q unit="1/A">0.181</Q><I unit="1/cm">0.904452</I><Idev unit="1/cm">0.0403216</Idev><Qdev unit="1/A">0</Qdev></Idata>
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+		</SAStransmission_spectrum>
+		<SASsample>
+			<ID>LOQ_Standard_TK49_SANS</ID>
+		</SASsample>
+		<SASinstrument>
+			<name>LOQ</name>
+			<SASsource>
+				<radiation>Spallation Neutron Source</radiation>
+			</SASsource>
+			<SAScollimation/>
+			<SASdetector>
+				<name>HAB</name>
+				<SDD unit="m">0.579</SDD>
+			</SASdetector>
+			<SASdetector>
+				<name>main-detector-bank</name>
+				<SDD unit="m">4.14902</SDD>
+			</SASdetector>
+		</SASinstrument>
+		<SASprocess>
+			<name>Mantid generated CanSAS1D XML</name>
+			<date>10-Oct-2013 16:00:29</date>
+			<term name="svn">2.6.20130902.1504</term>
+			<term name="user_file">K:/masks/MASKLOQ_MAN_133D_Xpress_8mm.txt</term>
+			<SASprocessnote/>
+		</SASprocess>
+		<SASnote>
+		</SASnote>
+	</SASentry>
+</SASroot>
