Just image the XML file to be a class named A, the XSL file to be a function in Class B, so if we want to call the function in A, we need to make sure both A and B are under the same namespace.
I think the XSL and XML need to follow this rule, too.
I add the namespace in XSL File because the XML file has already been in a namespace.
>>In this way references in the XML will not need a dummy namespace
I notice that the XML file is created by Microsoft's Visual Studio.
So if we do not want the namespace, we need to control the program to let it create the XML file without the namespace so that we do not need to add the namespace in XSL file, too.
<THE CONTENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED>
MSDN Community Support
Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.