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Difference between revisions of "Entity UDI"

(combined NodeIdDatatype and NodeRelationDatatype)
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== Introduction ==
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#REDIRECT [[EntityId]]
This page defines a Higgins [[NodeIdDatatype]].
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== Definition ==
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* A [[NodeIdDatatype]] is a kind of URI [[Data Range]].
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* A [[NodeIdDatatype]] MAY be absolute or relative:
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** An absolute [[NodeIdDatatype]] MUST uniquely identify both a [[Context]] and a specific [[Node]] within that [[Context]].
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** A relative [[NodeIdDatatype]] MUST uniquely identify a [[Node]] within a given [[Context]].
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* A [[NodeIdDatatype]] MUST conform to the ABNF defined below.
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== ABNF ==
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The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines the syntax of a Higgins [[NodeIdDatatype]]. Rules not defined in this ABNF are defined in either:
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* The [[ContextIdDatatype]] definition, or
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* 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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NodeIdDatatype    = AbsoluteNodeId / RelativeNodeId
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AbsoluteNodeId    = AbsoluteNodeURI / AbsoluteNodeXRI
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AbsoluteNodeURI    = ContextURI [ "#" ifragment ]
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AbsoluteNodeXRI    = ContextXRI [ "//" xri-segment ]
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RelativeNodeId    = ifragment / xri-segment
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== Notes ==
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* In an '''AbsoluteNodeId''', a '''RelativeNodeId''' is optional when the [[Context]] identified by the '''ContextURI''' or '''ContextXRI''' contains exactly one [[Node]].
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* The '''AbsoluteNodeURI''' form is consistent with one of the two proposed forms of [http://www.w3.org/TR/2007/WD-cooluris-20071217/ Cool URIs] defined by the [http://www.w3.org/ W3C].
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* The '''AbsoluteNodeXRI''' form 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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* See [[Context Discovery]] for rules defining resolution of an instance of a [[NodeIdDatatype]].
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== Relationship to OpenID ==
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* An [http://openid.net/specs/openid-authentication-2_0.html OpenID 2.0] compliant URL or XRI may serve as an absolute [[NodeIdDatatype]]. See [[ContextIdDatatype]] for details.
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== See Also ==
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* [[ContextIdDatatype]]
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* [[ContextId]]
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* [[NodeId]]
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* [[Higgins Global Graph]]
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== Links ==
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* [http://eclipse.org/higgins Higgins Home]
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Latest revision as of 22:50, 9 November 2010

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