> All of these are grammar-specifications that allow you to define the > structure of your XML-documents with more constraints.
Ok, I should have foreseen the schema checker answer...my point really is that yacc can do even more than just checking the conformance to a grammar. It also allows me to specify semantic actions, e.g. to help in building an abstract syntax tree from the concrete syntax tree, or to implement a very basic interpreter... mock example: <input><definevar name="a" value="10"/><definevar name="b" value="12" / ></input> <output><sum arg1="a" arg2="b"/></output> No schema checker can take this specification and simply output "22". XSLT might be able to implement it, but it is complex for anything real-life. Elementtree can immediately give me the concrete syntax tree, but any semantic actions have to be implemented during a manually programmed tree traversal. Anyway, it is not urgent for me, I have something which works, it just seems like something's missing still from the existing XML tool collection. Or I am being thick-headed ;) -- http://mail.python.org/mailman/listinfo/python-list
