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Difference between revisions of "Node Relation"
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== Details == | == Details == | ||
| − | Note: If the two [[ | + | Note: If the two [[Entity | Entities]] being linked are digital representations of the same person, thing or concept then a specialization of [[Relation]] called a [[Correlation]] should be used. |
==Format== | ==Format== | ||
Revision as of 18:53, 31 January 2008
Definition
- A Relation is a type of Attribute
- The value of a Relation is a URI that identifies an Entity in a Context
Details
Note: If the two Entities being linked are digital representations of the same person, thing or concept then a specialization of Relation called a Correlation should be used.
Format
A Relation is a URI. It is comprised of a ContextId URI combined with an optional identifier string called a LocalId. The LocalId, if present, uniquely identifies a Entity within the Context identified by the ContextId. The LocalId may only be omitted when the Context identified by the ContextId contains exactly one Entity.
Two kinds of Relations are defined: a URIrelation (Hash URI) and XRIrelation. 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 Relation. Rules not defined in this ABNF are defined in the ABNF for XRI 2.0 (which includes the IRI ABNF from RFC 3987).
relation = URIrelation / XRIrelation URIrelation = contextURI [ "#" subjectId ] XRIrelation = contextXRI [ "//" subjectId ]
Relationship to OpenID
- A Relation's ContextId MAY use OpenID (2.0 only) for its authority segment. See ContextId for details.