Name Identifier Mapping Protocol

The Name Identifier Mapping Protocol defines how service providers can obtain name identifiers that are assigned to a principal that has federated in the name space of a different service provider. When a principal authenticated to one service provider requests access to a second service provider site, the second service provider can use this protocol to obtain the name identifier. The protocol allows the second service provider to communicate with the first service provider about the principal even though no identity federation for the principal exists between them.