In VS 2008 / SDK 6.0 I used the /t option of the XSD utility to automatically generate XSD files from existing assemblies / classes. With VS 2010 and SDK 7.0 this isn’t working any longer, because the XSD.EXE can’t process the new Framework 4.0 assemblies. It stated to be a Framework 2.0 tool and can’t process assemblies of newer runtimes.
Where is my mistake?
It sounds like you are using xsd.exe that came with VS 2008 to create xsd files for .net 4 assemblies. Should you not be using the version that came with VS 2010
A second opinion (Ben Robinson), a closer look and there is the answer to my own question:
There are two XSD tools coming with VS 2010!
Microsoft SDKs/Windows/v7.0A/bin/xsd.exe – the XSD tool for the older frameworks
Microsoft SDKs/Windows/v7.0A/bin/NETFX 4.0 Tools/xsd.exe – the XSD tool for framework 4.0 assemblies
The first time I take the wrong one :-)