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− | ==Definition==
| + | #REDIRECT [[Entity Relation]] |
− | A [[Subject Relation]] is a relation stored as an [[Identity Attribute]] of a [[Digital Subject]] that links one [[Digital Subject]] to another [[Digital Subject]] in the same or within a different [[Context]].
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− | ==In Higgins==
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− | A [[Subject Relation]] is a URI. It is comprised of a [[ContextId]] URI combined with an optional identifier string called a [[SubjectId]] which if present is preceded by a forward slah, that uniquely identifies a [[Digital Subject]] within the [[Context]] identified by the [[ContextId]]. The [[SubjectId]] may only be omitted when the [[Context]] identified by the [[ContextId]] contains exactly one [[Digital Subject]].
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− | Two kinds of [[Relation]]s are defined a URIrelation (Hash URI) and XRIrelation. The former is consistent with one of the two proposed W3C Cool URI approaches. The The latter is an [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf XRI 2.0].
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− | === ABNF ===
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− | The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines a Higgins [[Relation]]. 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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− | relation = URIrelation / XRIrelation
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− | URIrelation = contextURI [ "#" subjectId ]
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− | XRIrelation = contextXRI [ "//" subjectId ]
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− | ==See Also==
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− | * [[SubjectId]]
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− | * [[ContextId]]
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− | * [[Concepts]]
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− | == Links ==
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− | * [http://eclipse.org/higgins Higgins Home]
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