XML doc comments are not stored in assembly metadata. In fact, Visual Studio and other tools such as Reflector post XML document comments by looking at a set of known paths containing XML document comment files.
If you want to view the XML documentation for your own assemblies, make sure that the XML file is in the same directory as the assembly reference and has the same name as your assembly (except for the extension). For example, MyAssembly.Namespace.XML corresponds to the assembly MyAssembly.Namespace.dll .
See How to see XML comments from Reflector for more information.
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