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Difference between revisions of "ContextId"
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== Definition == | == Definition == | ||
| − | * A [[ContextId]] is a kind of [[ | + | * 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]]. | |
| − | * | + | |
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== Details == | == Details == | ||
| − | * The value of a [[ContextId]] | + | * The [[Identity Attribute Service (IdAS)]] can be used as a service to access a [[Context]] given a [[ContextId]]. |
| + | * 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]]. | ||
| + | * It is not required for a [[ContextId]]s may not resolvable to a [[Context]] instance. 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]]. | ||
* Two different [[ContextId]]s may refer to the same [[Context]]. | * Two different [[ContextId]]s may refer to the same [[Context]]. | ||
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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 [[Digital Identity|Digital Identities]] 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 [[Digital Identity|Digital Identities]] 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). | ||
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== See Also == | == See Also == | ||
* [[EntityId]] | * [[EntityId]] | ||
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* [[Context Discovery]] | * [[Context Discovery]] | ||
* [[Context Discovery Components]] | * [[Context Discovery Components]] | ||
Revision as of 00:14, 1 February 2008
Contents
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
- The Identity Attribute Service (IdAS) can be used as a service to access a Context given a ContextId.
- 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.
- It is not required for a ContextIds may not resolvable to a Context instance. 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.
- Two different ContextIds may refer to the same Context.
- 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 Digital Identities 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