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Difference between revisions of "Context"
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This page describes the concept of [[Context]] used in the [[Higgins Global Graph 1.1]] | This page describes the concept of [[Context]] used in the [[Higgins Global Graph 1.1]] | ||
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== Definition == | == Definition == | ||
Revision as of 13:09, 22 April 2008
{{#eclipseproject:technology.higgins}}
Version
This page describes the concept of Context used in the Higgins Global Graph 1.1
Definition
- Is a set of one or more Nodes
- Is identified by a ContextId Data Range UDI
- Has one ContextId Attribute
- May have additional Attributes.
- Has a schema (ontology) that describes kinds of Nodes and Attributes that an instance of this Context contains.
- Has its own security and access control policy
Examples
Examples of Contexts that contain multiple Nodes include: directories, informal groups, project teams, collaboration spaces, and communications systems and networks. Examples of Contexts that, at least from the point of view of the authenticated consumer, typically contain only a single Node are: driver's licenses, credit cards, business cards, and many other kinds of security devices.
HOWL
In IdAS
IdAS consumers must be able to provide the required authentication materials to "open" i.e. authenticate to a Context. Once opened, the contents of the Context can be searched, read and updated to varying extents based on the authorization policy of the Context.
Footnote
Some Contexts are abstract. An example of an abstract Context would be the internet mail Context associated with the internet mail ContextId Data Range. The Nodes within this Context have a NodeId Data Range that is an email address (e.g. "foo@boo.com") within the email namespace defined by internet mail. This ContextId Data Range cannot be resolved to a physical Context because there is no globally defined set of all email addresses.