Notice: This Wiki is now read only and edits are no longer possible. Please see: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/wikis/Wiki-shutdown-plan for the plan.
Difference between revisions of "NodeRelationDatatype"
(→Definition) |
(→Definition) |
||
| Line 2: | Line 2: | ||
==Definition== | ==Definition== | ||
* An [[EntityRelationDatatype]] is a kind of URI [[Attribute Value Datatype]] | * An [[EntityRelationDatatype]] 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 [[EntityIdDatatype]]. The [[EntityIdDatatype]] may only be omitted when the [[Context]] identified by the [[ContextId]] contains exactly one [[Entity]]. | * 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]]. | ||
Revision as of 00:01, 1 February 2008
Introduction
Definition
- An EntityRelationDatatype 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 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 combine EntityRelationDatatype and EntityIdDatatype?
- In other words 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