c#: Hello,
in VS.Net, you can use tags like <summary>, <param ...>, <return>, etc.
in your comments.

How can I add my own tags? I think I have to modify the xsd scheme used
by VS.Net, But I don't know where it is located, and where I can find
some documentation to add my own syntax.

Thank you

If you use NDoc it's documentation describes how to extend NDoc to
recognise your own custom tags. From that I think you can infer that
you can use any tag you like in VS.net but it'll be ignored if it not
one of the recognised built in tags.