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Difference between revisions of "NodeRelationDatatype"
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== Relationship to OpenID == | == Relationship to OpenID == | ||
| − | * An [[ | + | * An [[EntityRelationDatatype]]'s [[ContextId]] MAY use OpenID (2.0 only) for its authority segment. See [[ContextId]] for details. |
==Open Issues== | ==Open Issues== | ||
* Should we allow the [[ContextIdDatatype]] to be omitted if a [[EntityIdDatatype ]] is present? (saves repeating the [[ContextIdDatatype]] when referring to another [[Entity]] in the same [[Context]] | * Should we allow the [[ContextIdDatatype]] to be omitted if a [[EntityIdDatatype ]] is present? (saves repeating the [[ContextIdDatatype]] when referring to another [[Entity]] in the same [[Context]] | ||
Revision as of 23:45, 31 January 2008
Introduction
Definition
- An EntityRelationDatatype is a URI.
- It is comprised of a ContextIdDatatype URI combined with an optional identifier string called a EntityIdDatatype. The EntityIdDatatype may only be omitted when the Context identified by the ContextId contains exactly one Entity.
Two kinds of EntityIdDatatypes are defined: a URI-EntityIDDatatype (Hash URI) and XRI-EntityIDDatatype. 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 [[EntityId]. Rules not defined in this ABNF are defined in the ABNF for XRI 2.0 (which includes the IRI ABNF from RFC 3987).
EntityIdDatatype = URI-EntityIdDatatype / XRI-EntityIdDatatype URI-EntityIdDatatype = URI-ContextIdDatatype [ "#" EntityIdDatatype ] XRI-EntityIdDatatype = XRI-ContextIdDatatype [ "//" EntityIdDatatype ]
Relationship to OpenID
- An EntityRelationDatatype's ContextId MAY use OpenID (2.0 only) for its authority segment. See ContextId for details.
Open Issues
- Should we allow the ContextIdDatatype to be omitted if a EntityIdDatatype is present? (saves repeating the ContextIdDatatype when referring to another Entity in the same Context