In this chapter, we gave
a formal de?¬?nition of claimsand digital identityin the section
???Some De?¬?nitions.??? The reasons why an identity is well modeled
by a set of claims have been given throughout the entire
text. Now that we have de?¬?ned the key roles and the relationships
among them, it is natural to adopt claim-based identities
as the currency exchanged in the Identity Metasystem.
Negotiation
The various participants in the Identity Metasystem support
many different identi?¬?cation technologies. How can we achieve
interoperability? One important component of the solution lies
in the need for a negotiation protocol.
Let??™s introduce what we mean by negotiation with an example.
An Italian person and a Chinese person, perfect strangers, go to
an international conference. They meet in the elevator. The
Chinese person says to the Italian person ??? ??? and the
Italian person answers ???Non capisco!??? As soon as it??™s clear that
they can??™t understand each other, they shrug and part ways.
Imagine the same scene, but this time the two are wearing the
conference badges mentioned in the section ???Directed Identity???
that identify the languages they speak.
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