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Difference between revisions of "Context"
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| − | A Higgins [[Context]] is a set of one or more [[Digital Subject]]s identified by a [[ | + | A Higgins [[Context]] is a set of one or more [[Digital Subject]]s identified by a [[ContextId]]. Some [[Context]]s are abstract; their [[ContextRef]]s are not resolvable to a physical [[Context]] instance. Most [[Context]]s are not abstract; through a network (or local) data access service their [[ContextRef]]s are resolvable to data objects that are instantiated and managed by [[Context Provider]] plug-ins. |
| − | Every [[Digital Subject]] within a [[Context]] has a unique identifier called | + | Every [[Digital Subject]] within a [[Context]] has a unique identifier called a SubjectId --a contextually unique identifier [[Identity Attribute]]. This identifier is unique within a namespace that is either (a) defined by the [[Context]], C1, itself, or (b) defined externally by some other [[Context]], C2, of which the C1 is a subset. |
Examples of (non-abstract) [[Context]]s that contain multiple [[Digital Subject]]s include: directories, informal groups, project teams, collaboration spaces, and communications systems and networks. Examples of [[Context]]s that, at least from the point of view of the authenticated consumer, typically contain only a single Digital Subject are: driver's licenses, credit cards, business cards, and many other kinds of security devices. | Examples of (non-abstract) [[Context]]s that contain multiple [[Digital Subject]]s include: directories, informal groups, project teams, collaboration spaces, and communications systems and networks. Examples of [[Context]]s that, at least from the point of view of the authenticated consumer, typically contain only a single Digital Subject are: driver's licenses, credit cards, business cards, and many other kinds of security devices. | ||
| − | An example of an abstract [[Context]] would be the internet mail [[Context]] associated with the internet mail [[ | + | An example of an abstract [[Context]] would be the internet mail [[Context]] associated with the internet mail [[ContextId]]. The [[Digital Subject]]s within this [[Context]] have a SubjectId that is an email address (e.g. "foo@boo.com") within the email namespace defined by internet mail. This [[ContextId]] cannot be resolved to a physical [[Context]] because there is no globally defined set of all email addresses. |
Every [[Context]] has a schema that describes kinds of [[Digital Subject]]s and [[Identity Attribute]]s that an instance of this [[Context]] contains. | Every [[Context]] has a schema that describes kinds of [[Digital Subject]]s and [[Identity Attribute]]s that an instance of this [[Context]] contains. | ||
| − | Contexts are identified by URIs called [[ | + | Contexts are identified by URIs called [[ContextId]]s. The [[Identity Attribute Service]] is the Higgins component that is used to connect to a [[Context]] and open it. Every [[Context]] has its own security policy, consumers must be able to provide the required [[Digital Identity]] object 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]]. |
==See Also== | ==See Also== | ||
Revision as of 23:39, 4 May 2007
A Higgins Context is a set of one or more Digital Subjects identified by a ContextId. Some Contexts are abstract; their ContextRefs are not resolvable to a physical Context instance. Most Contexts are not abstract; through a network (or local) data access service their ContextRefs are resolvable to data objects that are instantiated and managed by Context Provider plug-ins.
Every Digital Subject within a Context has a unique identifier called a SubjectId --a contextually unique identifier Identity Attribute. This identifier is unique within a namespace that is either (a) defined by the Context, C1, itself, or (b) defined externally by some other Context, C2, of which the C1 is a subset.
Examples of (non-abstract) Contexts that contain multiple Digital Subjects 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 Digital Subject are: driver's licenses, credit cards, business cards, and many other kinds of security devices.
An example of an abstract Context would be the internet mail Context associated with the internet mail ContextId. The Digital Subjects within this Context have a SubjectId that is an email address (e.g. "foo@boo.com") within the email namespace defined by internet mail. This ContextId cannot be resolved to a physical Context because there is no globally defined set of all email addresses.
Every Context has a schema that describes kinds of Digital Subjects and Identity Attributes that an instance of this Context contains.
Contexts are identified by URIs called ContextIds. The Identity Attribute Service is the Higgins component that is used to connect to a Context and open it. Every Context has its own security policy, consumers must be able to provide the required Digital Identity object 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.