Claim transformers are also the element
that makes complex trust-chaining scenarios possible. A company
that sells houses may only consider candidates who have
been certi?¬?ed as eligible by a consulting ?¬?rm. The consulting
?¬?rm may trust the statements from a pool of banks for issuing
eligibility certi?¬?cates. The bank where you keep your main account
may be part of that pool of banks. A claim transformer is
the means through which the trust chain can percolate from you
to the house seller. Your identity of bank customer can be sent to
the consultancy ?¬?rm, which in turn will issue an identity that
satis?¬?es the house seller.
Claim transformers are one vital component of the Identity
Metasystem. There will be quite a few scenarios in which claim
transformers will not be necessary. If all parties in a transaction
understand the semantic of the claims required, they can all ?¬?nd
a common technological ground, and there are only single-hop
trust relationships, so the claims can be consumed without further
processing. However, those scenarios cover only the simplest
and cleanest situations. Even if in the future the semantic
Web or a similar movement leads to a very large base of commonly
accepted claims, there will always be scenarios in which
the trust must be brokered, in which new technologies must be
integrated, and in which some organizational gulf must be
bridged.
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