Anne - I think the requirements of reliable-messaging and transactions are
trivial compared with those of crypto-security, authorization and privacy.
Reliable-messaging policies (for instance) need to indicate whether a
function (e.g. acknowledgments or message-sequence integrity)) is supported
or not, and what the minimum permissible resend interval is, or what the
maximum storage interval for message identifiers is. So, I believe the
functions defined in XACML v1.0 are sufficient for these cases.
All the best. Tim.