You should have the following:
All the schema documents necessary to validate (except dependencies not packaged).
A main "readme" document that describes how to:
Technology assumptions and dependencies.
Any information about where to get additional schema documents if you aren't going to package dependencies.
How to install.
A description of where the parts are in the distribution.
How to use the schemata.
Schema documentation.
Schema reference materials (e.g. xsddoc) generated from the schemata.
Valid examples along with descriptions of the examples.
License, ownership, and where to get more information.
A catalog for using the schemata.