I'm trying to develop an xsd that describes java classes and their member fields. The xml content files that use this xsd will be created by other development teams, and I want to use features of xml schema to ensure that their content makes sense. In specific, a class should only be defined once, and a field should only be defined once per class.
I was able to specify classname as a key, but I am having trouble writing the xpath expressions to enforce the uniqueness of a field relative to its containing class element.
Does anyone know or have any ideas about how to do this?
Below are simplified xsd and xml for this problem.