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| − | == Introduction ==
| + | #REDIRECT [[EntityId]] |
| − | This page defines a Higgins [[NodeIdDatatype]].
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| − | == Definition ==
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| − | * A [[NodeIdDatatype]] is a kind of URI [[Data Range]].
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| − | * A [[NodeIdDatatype]] MAY be absolute or relative:
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| − | ** An absolute [[NodeIdDatatype]] MUST uniquely identify both a [[Context]] and a specific [[Node]] within that [[Context]].
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| − | ** A relative [[NodeIdDatatype]] MUST uniquely identify a [[Node]] within a given [[Context]].
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| − | * A [[NodeIdDatatype]] MUST conform to the ABNF defined below.
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| − | == ABNF ==
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| − | The following [http://en.wikipedia.org/wiki/Augmented_Backus-Naur_form ABNF] defines the syntax of a Higgins [[NodeIdDatatype]]. Rules not defined in this ABNF are defined in either:
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| − | * The [[ContextIdDatatype]] definition, or
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| − | * 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]).
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| − | NodeIdDatatype = AbsoluteNodeId / RelativeNodeId
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| − | AbsoluteNodeId = AbsoluteNodeURI / AbsoluteNodeXRI
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| − | AbsoluteNodeURI = ContextURI [ "#" ifragment ]
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| − | AbsoluteNodeXRI = ContextXRI [ "//" xri-segment ]
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| − | RelativeNodeId = ifragment / xri-segment
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| − | == Notes ==
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| − | * In an '''AbsoluteNodeId''', a '''RelativeNodeId''' is optional when the [[Context]] identified by the '''ContextURI''' or '''ContextXRI''' contains exactly one [[Node]].
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| − | * The '''AbsoluteNodeURI''' form is consistent with one of the two proposed forms of [http://www.w3.org/TR/2007/WD-cooluris-20071217/ Cool URIs] defined by the [http://www.w3.org/ W3C].
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| − | * The '''AbsoluteNodeXRI''' form is an [http://en.wikipedia.org/wiki/XRI XRI] as defined by [http://wiki.oasis-open.org/xri/XriCd02/Xri2dot0Abnf XRI Syntax 2.0].
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| − | * See [[Context Discovery]] for rules defining resolution of an instance of a [[NodeIdDatatype]].
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| − | == Relationship to OpenID ==
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| − | * An [http://openid.net/specs/openid-authentication-2_0.html OpenID 2.0] compliant URL or XRI may serve as an absolute [[NodeIdDatatype]]. See [[ContextIdDatatype]] for details.
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| − | == Examples ==
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| − | === AbsoluteNodeURIs ===
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| − | ==== Filenames ====
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| − | file://system/config/openid.xrds#pault
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| − | file://system/config/openid.xdi#pault
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| − | file://system/config/ldap.xrds#pault
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| − | file://system/config/ldap.xdi#pault
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| − | ==== URLs ====
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| − | http://example.com#49387
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| − | https://example.com#49387
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| − | http://example.com/higgins/openid.xrds#49387
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| − | https://example.com/higgins/openid.xdi#49387
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| − | http://example.com/higgins/ldap.xrds#49387
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| − | https://example.com/higgins/ldap.xdi#49387
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| − | === AbsoluteNodeXRIs ===
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| − | ==== XRI 2.0 Form ====
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| − | =drummond/($context)*($openid)//=drummond
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| − | =drummond/($context)*($ldap)//dreed
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| − | =!F83.62B1.44F.2813/($context)*($openid)//=drummond
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| − | =!F83.62B1.44F.2813/($context)*($ldap)//dreed
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| − | =drummond*mom/($context)*($openid)//spr
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| − | =drummond*mom/($context)*($ldap)//spreed
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| − | @example/($context)//Example%20Corp
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| − | @example/($context)*($openid)//@!2C75.AC49.21D3.1207
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| − | @example/($context)*($ldap)//corp
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| − | @free*example/($context)*($openid)//example
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| − | @free*example/($context)*($ldap)//example
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| − | ==== Proposed XRI 3.0 Form ====
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| − | =drummond/$context$openid//=drummond
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| − | =drummond/$context$ldap//dreed
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| − | =!F83.62B1.44F.2813/$context$openid//=drummond
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| − | =!F83.62B1.44F.2813/$context$ldap//dreed
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| − | =drummond*mom/$context$openid//spr
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| − | =drummond*mom/$context$ldap//spreed
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| − | @example/$context//Example%20Corp
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| − | @example/$context$openid//@!2C75.AC49.21D3.1207
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| − | @example/$context$ldap//corp
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| − | @free*example/$context*$openid//example
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| − | @free*example/$context$ldap//example
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| − | === HXRIs ===
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| − | A HXRI ("HTTP XRI") is an XRI that uses an HXRI proxy resolver prefix. "xri.net" is a public HXRI proxy resolver operated by XDI.org. All others are examples.
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| − | ==== XRI 2.0 Form ====
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| − | https://xri.net/=drummond/($context)*($openid)//=drummond
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| − | https://xri.net/=drummond*mom/($context)*($openid)//spr
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| − | http://xri.example.com/@example/($context)*($openid)//@example
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| − | http://xri.example.com/@free*example/($context)*($openid)//example
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| − | https://xri.example.org/@1000.a1b2.c3d4.9999!1234/($context)*($ldap)//example
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| − | ==== Proposed XRI 3.0 Form ====
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| − | https://xri.net/=drummond/$context$openid/=drummond
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| − | https://xri.net/=drummond*mom/$context$openid//spr
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| − | http://xri.example.com/@example/$context$openid//@example
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| − | http://xri.example.com/@example*free/$context$openid//example
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| − | https://xri.example.org/@1000.a1b2.c3d4.9999!1234/$context$ldap//example
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| − | == See Also ==
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| − | * [[ContextIdDatatype]]
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| − | * [[ContextId]]
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| − | * [[NodeId]]
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| − | * [[Higgins Global Graph]]
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| − | == Links ==
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| − | * [http://eclipse.org/higgins Higgins Home]
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