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| − | Although a [[Digital Subject]] may have any number of identifier [[Identity Attribute]]s it MUST have one identifier that uniquely identifies it within its containing [[Context]]. This identifier is called the [[SubjectId]]. Note that the containing [[Context]] also has a unique identifier, the [[ContextId]], and that the combination of the [[ContextId]] and the [[SubjectId]] is an absolute unique identifier that is used in Higgins [[Relation]]s.
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| − | == ABNF ==
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| − | Rules not defined in this ABNF are defined in the [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf ABNF for XRI 2.0] (which includes the IRI ABNF from [http://www.ietf.org/rfc/rfc3987.txt RFC 3987]).
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| − | subjectId = ifragment / xri-segment
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| − | ==See Also==
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| − | *[[Concepts]]
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| − | *[[ContextId]]
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| − | *[[Relation]]
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| − | ==Links==
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| − | *[http://eclipse.org/higgins Higgins Home]
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