dotnet xml: I have troubles validating XML files with key/keyref constraints.

Here´s my schema:
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:transNS="http://Festo.Common.Translation"
xmlns="http://Festo.Common.Translation"
targetNamespace="http://Festo.Common.Translation"
elementFormDefault="qualified" attributeFormDefault="unqualified"
version="1.0.1">
<xsd:simpleType name="stVersionSyntax">
<xsd:restriction base="xsd:string">
<xsd:pattern value="V[0-9]+\.[0-9]+\.[0-9]+"/>
<!-- e.g. V1.0.0, checked -->
</xsd:restriction>
</xsd:simpleType>
<xsd:element name="TranslationTable" type="ctTranslationTable">
<xsd:key name="LangKey">
<xsd:selector xpath="transNS:Language"/>
<xsd:field xpath="@ID"/>
</xsd:key>
<xsd:keyref name="LangKeyRef" refer="transNS:LangKey">
<xsd:selector xpath="transNS:Item/Translation"/>
<xsd:field xpath="@Language"/>
</xsd:keyref>
</xsd:element>
<xsd:complexType name="ctTranslationItem">
<xsd:sequence>
<xsd:element name="Translation" type="ctTranslation"
maxOccurs="unbounded"/>
<xsd:element name="Parameter" type="ctParameter" minOccurs="0"
maxOccurs="unbounded"/>
</xsd:sequence>
<xsd:attribute name="ID" type="xsd:string" use="required"/>
<!-- word to translate -->
</xsd:complexType>
<xsd:complexType name="ctTranslationTable">
<xsd:sequence>
<!-- general file information -->
<xsd:element name="Language" type="ctLanguage" minOccurs="0"
maxOccurs="unbounded"/>
<xsd:element name="Item" type="ctTranslationItem" minOccurs="0"
maxOccurs="unbounded">
<xsd:key name="TransKey">
<xsd:selector xpath="./Translation"/>
<xsd:field xpath="@Language"/>
</xsd:key>
</xsd:element>
</xsd:sequence>
<xsd:attribute name="Version" type="stVersionSyntax"/>
<!-- version of the file -->
</xsd:complexType>
<xsd:complexType name="ctTranslation">
<xsd:attribute name="Language" type="xsd:string" use="required"/>
<xsd:attribute name="Content" type="xsd:string" use="required"/>
</xsd:complexType>
<xsd:complexType name="ctParameter">
<xsd:attribute name="Index" type="xsd:int" use="required"/>
<xsd:attribute name="Ref" type="xsd:string" use="required"/>
</xsd:complexType>
<xsd:complexType name="ctLanguage">
<xsd:attribute name="ID" type="xsd:string" use="required"/>
<xsd:attribute name="Description" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:schema>

I define a key for the Languages and a keyref for each Translation item.
Here´s my XML-File:
<?xml version="1.0" encoding="UTF-8"?>
<TranslationTable xmlns="http://Festo.Common.Translation"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://Festo.Common.Translation
S:\Festo\Packages\Common\Festo.Common.Translation\XmlTranslationTable.xsd">
<Language Description="English" ID="EN"/>
<Item ID="Zero point">
<Translation Language="EN" Content="Zero point"/>
<Translation Language="DE" Content="Nullpunkt"/>
</Item>
</TranslationTable>

The Translation Item references the language "DE" which is not a member of
the languages. So, this must lead to a validation error but it does not!
A duplicate key is handled correctly while a missing keyref is not.
What´s interesting to me is that, if there is no namespace defined,
validation works fine.

Here´s my C# code snipped which validates the xml file:
m_SchemaCollection = new XmlSchemaCollection();
XmlTextReader xsdReader = new
XmlTextReader(typeof(TranslationTable).Assembly.GetManifestResourceStream("Festo.Common.Translation.XmlTranslationTable.xsd"));
m_SchemaCollection.Add(m_XmlNamespace, xsdReader);
xsdReader.Close();

StreamReader s= System.IO.File.OpenText(sTranslationTableFile);
string xmlFrag = s.ReadToEnd();
NameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
XmlParserContext context = new XmlParserContext(null, nsmgr, null,
XmlSpace.None);
xmlValidatingReader = new XmlValidatingReader(xmlFrag,
XmlNodeType.Element, context);
xmlValidatingReader.Schemas.Add(m_SchemaCollection);
xmlValidatingReader.ValidationType=ValidationType.Schema;
xmlValidatingReader.ValidationEventHandler+=new
ValidationEventHandler(transValidator_ValidationEventHandler); //PLEASE ADD A
VALIDATION HANDLER
while (xmlValidatingReader.Read()){} //Loop through elements
//f you reach here without hitting validations, you are OK
MessageBox.Show("DONE");
s.Close();

I validated the XML with both, the XMLSpy and the Sun-Xml Validator and both
detected the missing keyref!

What´s going wrong here?
Thank´s for your help in advance

You need to specify transNS prefix in ALL XPath expressions. In the schema
below, you only do it in a few places. When I updated the rest of the
expressions, system.xml generated the following errors:
- The identity constraint 'http://Festo.Common.Translation:LangKey'
validation has failed. Either a key is missing or the existing key has an
empty node.
- The identity constraint 'http://Festo.Common.Translation:TransKey'
validation has failed. Either a key is missing or the existing key has an
empty node.
- The identity constraint 'http://Festo.Common.Translation:TransKey'
validation has failed. Either a key is missing or the existing key has an
empty node.

--
Stan Kitsis
Program Manager, XML Technologies
Microsoft Corporation

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