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| − | {{#eclipseproject:technology.higgins}}
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| | [[Image:Higgins_logo_76Wx100H.jpg|right]] | | [[Image:Higgins_logo_76Wx100H.jpg|right]] |
| | == Version == | | == Version == |
| − | This page describes the concept of a [[ContextId]] as used in [[Higgins Global Graph 1.1]]. | + | This page describes the concept of a [[ContextId]] as used in [[Context Data Model 2.0]]. |
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| | == Definition == | | == Definition == |
| − | * A [[ContextId]] is a kind of [[Attribute]] that uniquely identifies a [[Context]]. | + | * An identifier of a [[Context]] |
| − | * The value of a [[ContextId]] MUST be a single instance of a [[ContextId Data Range]]. | + | * 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 ==
| + | [[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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| − | | + | |
| − | [[Category:Higgins Concepts]]
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