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Difference between revisions of "ContextId"
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== Definition == | == Definition == | ||
− | * A [[ContextId]] is | + | * A [[ContextId]] is an [[Attribute]] of a [[Context]] whose value is the [[ContextId Data Range]] [[UDI]] that identifies this same [[Context]] |
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== Details == | == Details == |
Revision as of 13:04, 22 April 2008
{{#eclipseproject:technology.higgins}}
Version
This page describes the concept of a ContextId as used in Higgins Global Graph 1.1.
Definition
- A ContextId is an Attribute of a Context whose value is the ContextId Data Range UDI that identifies this same Context
Details
- It is not required for a ContextIds to resolve to a Context instance in which case this is referred to as an abstract ContextId. However, most Contexts are not abstract, and can be resolved a network (or local) data access service to discover the information necessary to access the Context.
ContextIds and IdAS
- The Identity Attribute Service (IdAS) can be used as a service to access a Context given a ContextId.
- 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.
- A given ContextId may be used against multiple Context Providers to produce the same Context (although, as mentioned, different Context instances).