accounting_l10n_fr: set xsi:noNamespaceSchemaLocation for "Test Compta Demat"

The test software from
https://www.economie.gouv.fr/dgfip/outil-test-des-fichiers-des-ecritures-comptables-fec
only validates if the XSD is referenced with xsi:noNamespaceSchemaLocation

bt5/erp5_accounting_l10n_fr/SkinTemplateItem/portal_skins/erp5_accounting_l10n_fr/AccountingTransactionModule_viewComptabiliteAsFECXML.zpt

 <?xml version="1.0" encoding="UTF-8"?>
-<comptabilite xmlns:tal="http://xml.zope.org/namespaces/tal">
+<comptabilite xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="formatA47A-I-VII-1.xsd" xmlns:tal="http://xml.zope.org/namespaces/tal">
   <exercice>
     <DateCloture tal:content="python: options['at_date'].strftime('%Y-%m-%d')">20141231</DateCloture>
     <tal:block tal:repeat="result options/result_list"><tal:block tal:replace="structure python: result.detail.decode('zlib')"/></tal:block>

bt5/erp5_accounting_l10n_fr/TestTemplateItem/portal_components/test.erp5.testAccounting_l10n_fr.py

@@ -90,6 +90,25 @@ class TestAccounting_l10n_fr(AccountingTestCase):
     user = uf.getUser(self.username).__of__(uf)
     newSecurityManager(None, user)
 
+  def validateFECXML(self, tree):
+    # this "xsi:noNamespaceSchemaLocation" is used by xerces parser from
+    # https://github.com/DGFiP/Test-Compta-Demat/
+    noNamespaceSchemaLocation, = tree.xpath(
+      './@xsi:noNamespaceSchemaLocation',
+      namespaces={'xsi': 'http://www.w3.org/2001/XMLSchema-instance'})
+
+    import Products.ERP5.tests
+    with open(os.path.join(
+        os.path.dirname(Products.ERP5.tests.__file__),
+        'test_data',
+        noNamespaceSchemaLocation,
+    )) as f:
+      xmlschema_doc = etree.parse(f)
+      xmlschema = etree.XMLSchema(xmlschema_doc)
+
+    self.assertFalse(xmlschema.validate(etree.fromstring('<invalide/>')))
+    xmlschema.assertValid(tree)
+
   def test_FEC(self):
     account_module = self.portal.account_module
     self._makeOne(
@@ -145,14 +164,8 @@ class TestAccounting_l10n_fr(AccountingTestCase):
     else:
       self.fail("Attachment not found")
 
-    # validate against official schema
-    import Products.ERP5.tests
-    schema = etree.XMLSchema(etree.XML(open(os.path.join(
-        os.path.dirname(Products.ERP5.tests.__file__), 'test_data',
-        'formatA47A-I-VII-1.xsd')).read()))
-
-    # this raise if invalid
-    tree = etree.fromstring(fec_xml, etree.XMLParser(schema=schema))
+    tree = etree.fromstring(fec_xml)
+    self.validateFECXML(tree)
 
     debit_list = tree.xpath("//Debit")
     self.assertEqual(6, len(debit_list))
@@ -238,14 +251,8 @@ class TestAccounting_l10n_fr(AccountingTestCase):
     else:
       self.fail("Attachment not found")
 
-    # validate against official schema
-    import Products.ERP5.tests
-    schema = etree.XMLSchema(etree.XML(open(os.path.join(
-        os.path.dirname(Products.ERP5.tests.__file__), 'test_data',
-        'formatA47A-I-VII-1.xsd')).read()))
-
-    # this raise if invalid
-    tree = etree.fromstring(fec_xml, etree.XMLParser(schema=schema))
+    tree = etree.fromstring(fec_xml)
+    self.validateFECXML(tree)
 
     return tree