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| − | ==Definition==
| + | #REDIRECT [[Entity Relation]] |
| − | * A [[Relation]] is a type [[Attribute]]
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| − | * The value of a [[Relation]] is a URI that identifies an [[Entity]] in a [[Context]]
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| − | * If [[Entity]] A has a relation that points to [[Entity]] B this implies that both [[Entity | Entities]] are representations of the same real world natural person, thing or concept
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| − | == Details ==
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| − | Note: If the two [[Digital Subject]]s being linked are digital representations of the same real-world [[Entity]] then a specialization of [[Relation]] called a [[Correlation]] should be used.
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| − | ==Format==
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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]]. The [[SubjectId]], if present, 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's [http://www.w3.org/TR/2007/WD-cooluris-20071217/ Cool URIs] approaches. The latter is an [http://en.wikipedia.org/wiki/XRI XRI] as defined by [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf XRI Syntax 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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| − | == Relationship to OpenID ==
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| − | * A [[Relation]]'s [[ContextId]] MAY use OpenID (2.0 only) for its authority segment. See [[ContextId]] for details.
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| − | ==See Also==
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| − | * [[Correlation]]
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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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