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Difference between revisions of "NodeRelationDatatype"
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== Introduction == | == Introduction == | ||
| − | This page describes the Higgins [[ | + | This page describes the Higgins [[I-NodeRelationDatatype]]. |
==Definition== | ==Definition== | ||
| − | * An [[ | + | * An [[I-NodeRelationDatatype]] is a kind of URI [[Attribute Value Datatype]] |
* A [[ContextIdDatatype]] MUST conform to the ABNF defined below | * A [[ContextIdDatatype]] MUST conform to the ABNF defined below | ||
| − | * It is comprised of a [[ContextIdDatatype]] URI combined with an optional identifier string called a [[ | + | * It is comprised of a [[ContextIdDatatype]] URI combined with an optional identifier string called a [[I-NodeIdDatatype]]. The [[I-NodeIdDatatype]] may only be omitted when the [[Context]] identified by the [[ContextId]] contains exactly one [[Entity]]. |
| − | Two kinds of [[ | + | Two kinds of [[I-NodeIdDatatype]]s are defined: a URI-[[I-NodeIdDatatype]] (Hash URI) and XRI-[[I-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]. |
=== ABNF === | === ABNF === | ||
| − | The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines a Higgins [[ | + | The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines a Higgins [[I-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]). |
| − | + | I-NodeIdDatatype = URI-I-NodeIdDatatype / XRI-I-NodeIdDatatype | |
| − | URI- | + | URI-I-NodeIdDatatype = URI-ContextIdDatatype [ "#" I-NodeIdDatatype ] |
| − | XRI- | + | XRI-I-NodeIdDatatype = XRI-ContextIdDatatype [ "//" I-NodeIdDatatype ] |
== Relationship to OpenID == | == Relationship to OpenID == | ||
| − | * An [[ | + | * An [[I-NodeRelationDatatype]]'s [[ContextId]] MAY use OpenID (2.0 only) for its authority segment. See [[ContextId]] for details. |
==Open Issues== | ==Open Issues== | ||
| − | * | + | * We SHOULD combine [[I-NodeRelationDatatype]] and [[I-NodeIdDatatype]] |
| − | ** In other words should we allow the [[ContextIdDatatype]] to be omitted if a [[ | + | ** In other words should we allow the [[ContextIdDatatype]] to be omitted if a [[I-NodeIdDatatype ]] is present? (saves repeating the [[ContextIdDatatype]] value when referring to another [[I-Node]] in the same [[Context]] |
== See Also == | == See Also == | ||
| − | * [[ | + | * [[Higgins Global Graph]] |
| − | + | ||
| − | * [ | + | == Links == |
| + | * [http://eclipse.org/higgins Higgins Home] | ||
Revision as of 15:44, 3 February 2008
Contents
Introduction
This page describes the Higgins I-NodeRelationDatatype.
Definition
- An I-NodeRelationDatatype is a kind of URI Attribute Value Datatype
- A ContextIdDatatype MUST conform to the ABNF defined below
- It is comprised of a ContextIdDatatype URI combined with an optional identifier string called a I-NodeIdDatatype. The I-NodeIdDatatype may only be omitted when the Context identified by the ContextId contains exactly one Entity.
Two kinds of I-NodeIdDatatypes are defined: a URI-I-NodeIdDatatype (Hash URI) and XRI-I-NodeIdDatatype. The former is consistent with one of the two proposed W3C's Cool URIs approaches. The latter is an XRI as defined by XRI Syntax 2.0.
ABNF
The following ABNF defines a Higgins I-NodeIdDatatype. Rules not defined in this ABNF are defined in the ABNF for XRI 2.0 (which includes the IRI ABNF from RFC 3987).
I-NodeIdDatatype = URI-I-NodeIdDatatype / XRI-I-NodeIdDatatype URI-I-NodeIdDatatype = URI-ContextIdDatatype [ "#" I-NodeIdDatatype ] XRI-I-NodeIdDatatype = XRI-ContextIdDatatype [ "//" I-NodeIdDatatype ]
Relationship to OpenID
- An I-NodeRelationDatatype's ContextId MAY use OpenID (2.0 only) for its authority segment. See ContextId for details.
Open Issues
- We SHOULD combine I-NodeRelationDatatype and I-NodeIdDatatype
- In other words should we allow the ContextIdDatatype to be omitted if a I-NodeIdDatatype is present? (saves repeating the ContextIdDatatype value when referring to another I-Node in the same Context