Proposed change:

     The value included in a Policy[Set]IdReference element SHALL
     match the value of the Policy[Set]Id XML attribute in the
     referenced policy.

The current specifications do not clearly state this as a requirement.

The XACML TC would like feedback from any implementers or users who
would be affected by this proposed change.  Clearly, there must be only
one Policy[Set] that can match any given Policy[Set]IdReference, but
there are at least two use cases for letting different values in
Policy[Set]IdReference instances refer to the same Policy[Set]: for
examples, see
http://lists.oasis-open.org/archives/xacml/200703/msg00076.html

If you depend on allowing policy references that do NOT match the
internal policy identifiers, please

1) Send us your use case(s).
2) Indicate whether your usage is in a research implementation or in a
commercial planned or production system.
3) Let us know how difficult it would be for your system to adapt to the
proposed change, if it were made.

You are also invited to send use cases where the proposed change would
simplify your usage of XACML.