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Difference between revisions of "ContextId"

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== Introduction ==
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[[Image:Higgins_logo_76Wx100H.jpg|right]]
This page describes and defines a Higgins [[ContextId]].
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== Version ==
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This page describes the concept of a [[ContextId]] as used in [[Context Data Model 2.0]].
  
 
== Definition ==
 
== Definition ==
* A [[ContextId]] is a kind of [[Attribute]] that uniquely identifies the instance of a [[Context]] that contains it.
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* An identifier of a [[Context]]  
* The value of a [[ContextId]] MUST be a single instance of a [[ContextIdDatatype]].
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* A ''Context UDI'' as defined in [http://www.azigo.com/udi/udi-syntax.html UDI Syntax]
* Two different [[ContextId]]s may refer to the same [[Context]].
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* If the value of a [[ContextId]] is resolvable, its value should dereference the information necessary to discover how to access a [[Context]]. See [[Context Discovery]].
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== Details ==
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[[Category:Context Data Model 2.0]]
* It is not required for a [[ContextId]]s to resolve to a [[Context]] instance in which case this is referred to as an abstract [[ContextId]]. However, most [[Context]]s are not abstract, and can be resolved a network (or local) data access service to discover the information necessary to access the [[Context]].
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== ContextIds and IdAS==
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* The [[Identity Attribute Service (IdAS)]] can be used as a service to access a [[Context]] given a [[ContextId]].
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* If two [[ContextId]]'s values are equal, they refer to the same underlying [[Context]], although not necessarily the same [[Context]] "container" instance returned by IdAS. This means that, as a requester of information, different clients of IdAS may see different subsets of the [[Context]] based on the authorization passed in during authentication.
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* A given [[ContextId]] may be used against multiple [[Context Provider]]s to produce the same [[Context]] (although, as mentioned, different [[Context]] instances).
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== See Also ==
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* [[NodeId]]
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* [[Context Discovery]]
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* [[Context Discovery Components]]
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* [[Higgins XRDS Service Endpoint]]
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* [[Higgins XDI Context Descriptor]]
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* [[Concepts]]
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== Links ==
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* [http://eclipse.org/higgins Higgins Home]
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Latest revision as of 11:35, 31 May 2021

Higgins logo 76Wx100H.jpg

Version

This page describes the concept of a ContextId as used in Context Data Model 2.0.

Definition

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