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| − | == Introduction ==
| + | #REDIRECT [[NodeIdDatatype]] |
| − | This page describes the Higgins [[NodeRelationDatatype]].
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| − | ==Definition==
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| − | * A [[NodeRelationDatatype]] is a kind of URI [[Data Range]]
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| − | * A [[ContextIdDatatype]] MUST conform to the ABNF defined below
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| − | * It is comprised of a [[ContextIdDatatype]] URI combined with an optional identifier string called a [[NodeIdDatatype]]. The [[NodeIdDatatype]] may only be omitted when the [[Context]] identified by the [[ContextIdDatatype]] contains exactly one [[Node]].
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| − | Two kinds of [[NodeIdDatatype]]s are defined: a URI-[[NodeIdDatatype]] (Hash URI) and XRI-[[NodeIdDatatype]]. 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 [[NodeIdDatatype]]. 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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| − | NodeIdDatatype = URI-NodeIdDatatype / XRI-NodeIdDatatype
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| − | URI-NodeIdDatatype = URI-ContextIdDatatype [ "#" NodeIdDatatype ]
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| − | XRI-NodeIdDatatype = XRI-ContextIdDatatype [ "//" NodeIdDatatype ]
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| − | == Relationship to OpenID ==
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| − | * An [[NodeRelationDatatype]]'s [[ContextIdDatatype]] MAY use OpenID (2.0 only) for its authority segment. See [[ContextIdDatatype]] for details.
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| − | ==Open Issues==
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| − | * We SHOULD combine [[NodeRelationDatatype]] and [[NodeIdDatatype]]
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| − | ** In other words should we allow the [[ContextIdDatatype]] to be omitted if a [[NodeIdDatatype ]] is present? (saves repeating the [[ContextIdDatatype]] value when referring to another [[Node]] in the same [[Context]]
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| − | == See Also ==
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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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