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Difference between revisions of "Node Relation"

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==Definition==
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#REDIRECT [[Entity Relation]]
* An [[EntityId]] is a kind of [[Attribute]]
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* Each value of a [[EntityId]] is a URI(s) that identifies an [[Entity]]
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==Format==
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An [[EntityId]] is a URI. It is comprised of a [[ContextId]] URI combined with an optional identifier string called a [[LocalId]]. The [[LocalId]] may only be omitted when the [[Context]] identified by the [[ContextId]] contains exactly one [[Entity]].
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Two kinds of [[EntityId]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 [[EntityId]. 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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==Open Issues==
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* Should we allow the [[ContextId]] to be omitted if a [[LocalId]] is present? (saves repeating the [[ContextId]] when referring to another [[Entity]] in the same [[Context]]
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==See Also==
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* [[Correlation]]
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* [[LocalId]]
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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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Latest revision as of 13:55, 22 April 2008

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