XML schema validation

[SimonB]

Hi,

I have a XML file which I validate against a schema using the
following:

doc.Schemas.Add("", xsdSchema);
doc.Validate(new
System.Xml.Schema.ValidationEventHandler(Validatio nErrorEvent));

This works fine, and I get the correct error when changing element
names and structure.
But when the XML to validate contains a different namespace than the
one trying to validate I don't get an error, I can see why. So my
question is how do I define the schema or my code to fail validation
when a wrong NS is contained in the XML.

Samples:
<root><elements>value</elements></root// fails when containing a
structureerror.

<root xmlns="http://random-ns"><elements>value</elements></root//
doesn't fail.

Thanks
Simon