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Difference between revisions of "ContextId"
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== ContextIds and IdAS== | == ContextIds and IdAS== | ||
* The [[Identity Attribute Service (IdAS)]] can be used as a service to access a [[Context]] given a [[ContextId]]. | * 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. | * 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 Provider]]s to produce the same [[Context]] (although, as mentioned, different [[Context]] instances). | * A given [[ContextId]] may be used against multiple [[Context Provider]]s to produce the same [[Context]] (although, as mentioned, different [[Context]] instances). |
Revision as of 00:20, 1 February 2008
Introduction
This page describes and defines a Higgins ContextId.
Definition
- A ContextId is a kind of Attribute that uniquely identifies the instance of a Context that contains it.
- The value of a ContextId MUST be a single instance of a ContextIdDatatype.
Details
- Two different ContextIds may refer to the same Context.
- 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).
See Also
- EntityId
- Context Discovery
- Context Discovery Components
- Higgins XRDS Service Endpoint
- Higgins XDI Context Reference
- Concepts