Entity UDI

Introduction

This page defines a Higgins NodeIdDatatype.

Definition

• A NodeIdDatatype is a kind of URI Data Range.
• A NodeIdDatatype MAY be absolute or relative:
  • An absolute NodeIdDatatype MUST uniquely identify both a Context and a specific Node within that Context.
  • A relative NodeIdDatatype MUST uniquely identify a Node within a given Context.
• A NodeIdDatatype MUST conform to the ABNF defined below.

ABNF

The following ABNF defines the syntax of a Higgins NodeIdDatatype. Rules not defined in this ABNF are defined in either:

• The ContextIdDatatype definition, or
• The ABNF for XRI 2.0 (which includes the IRI ABNF from RFC 3987).

NodeIdDatatype     = AbsoluteNodeId / RelativeNodeId
AbsoluteNodeId     = AbsoluteNodeURI / AbsoluteNodeXRI
AbsoluteNodeURI    = ContextURI [ "#" ifragment ]
AbsoluteNodeXRI    = ContextXRI [ "//" xri-segment ]
RelativeNodeId     = ifragment / xri-segment

Notes

• In an AbsoluteNodeId, a RelativeNodeId is optional when the Context identified by the ContextURI or ContextXRI contains exactly one Node.
• The AbsoluteNodeURI form is consistent with one of the two proposed forms of Cool URIs defined by the W3C.
• The AbsoluteNodeXRI form is an XRI as defined by XRI Syntax 2.0.
• See Context Discovery for rules defining resolution of an instance of a NodeIdDatatype.

Relationship to OpenID

• An OpenID 2.0 compliant URL or XRI may serve as an absolute NodeIdDatatype. See ContextIdDatatype for details.

See Also

• ContextIdDatatype
• ContextId
• NodeId
• Higgins Global Graph

Links

• Higgins Home