WSH Use Case Focus Points

a) ID-WSF & WS-* harmonization implies profiling WS-Trust to allow a WSC to obtain security tokens
b) the above (may) implies separating discovery from token issuance
c) separating discovery from token issuance introduces the possibility of using different discovery mechanisms, like XRDS
d) some of Andy/John's scenarios (we need a better descriptor) touch on the above application of XRDS