What is the relationship / purpose between ClaimTypesRequested in the IP-STS and ClaimTypeRequired in the RP

Question

The ClaimTypesRequested section seems to be built up from the “Claim Descriptions” tab in ADFS and the web.config and metada inherit this when “bound” via FedUtil.

• Does WIF compare the two in any way?
• Does the RP list have to be a subset?
• Are any errors thrown when “out of sync”?

e.g. you can define custom claims in the ADFS claims rules that don’t appear in either list and yet seem to get through to the RP?