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Difference between revisions of "ContextId"
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Revision as of 23:20, 31 January 2008
Contents
Introduction
This page describes and defines a Higgins ContextId.
Definition
- A ContextId is a kind of Context Correlation
- A ContextId identifies a instance of a Context
- A ContextId MUST have a single value of type ContextIdDatatype
- If a Context has a ContextId Attribute its value identifies the Context itself.
Details
- The value of a ContextId must directly or indirectly (e.g. by resolution) provide sufficient information to identify a Context. See the Context Discovery with a ContextId heading below.
- Two different ContextIds may refer to the same Context.
ContextId and IdAS
- 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).
Details
- The Identity Attribute Service (IdAS) can be used as a service to access a Context given a ContextId
Some ContextIds are not resolvable to a Context instance. Most Contexts are not abstract. Using a network (or local) data access service their ContextIds are resolvable to data objects that are instantiated and managed by Context Provider plug-ins.
Open Issues
- Should the contextId ABNF support IRI (Internationalized Resource Identifiers) and not just URIs? Note that the ABNF above uses IRI rules; this needs to be changed if only URIs will be supported.
See Also
- EntityId
- LocalId
- Context Discovery
- Context Discovery Components
- Higgins XRDS Service Endpoint
- Higgins XDI Context Reference
- Concepts