W3C Finding Relevant to WI #11 - XACML Extension Points

The following (draft) document from the W3C TAG discusses strategies for
evolving (versioning) XML specifications.

Section 9 discusses a technique for inserting generalized extension points
in XML Schemas.

http://www.w3.org/2001/tag/doc/versioning-20031003.html

This seems relevant to Work Item #11.

Hal