Difference between revisions of "Attribute"

Revision as of 16:08, 31 January 2008

Definition

An Attribute is a sub-object of an Entity or a Context.
An Attribute has a URI-valued type.
An Attribute has one or more values
Each individual value may be simple (a literal) or complex (a structured value)

Examples

The physical person Bob Smith might be represented as an Entity in the Context of his employer, the Port Control Authority. This Entity might have the following types of Identity Attributes (and associated values) in this context:

email-address = bob@portcontrol.gov
phone number = {617-555-1234, 617-333-4321}
passport information = ...etc.
fingerprint data = ...etc.

This same physical person Bob Smith is also represented as a Entity in a "customer-to-Clothes-R-Us" Context (this customer's relationship with the Clothes-R-Us merchant. In this Context Bob has these Identity Attributes:

platinumCustomer = True
preferredColor = "blue"

HOWL

In Higgins

Types

In Higgins a Identity Attribute is identified by a URI that defines its type. The URI http://openschemas.org/2006/person/surname might indicate an Identity Attribute that represented a person's last name. The schema associated with the containing Context provides metadata about this URI.

@@ Line 28: / Line 28: @@
 In Higgins a [[Identity Attribute]] is identified by a URI that defines its type. The URI http://openschemas.org/2006/person/surname might indicate an [[Identity Attribute]] that represented a person's last name. The schema associated with the containing [[Context]] provides metadata about this URI.
-===Values===
-* An [[Identity Attribute]] may have one or more values
-* The values may be literal types (defined by the XML Schema literal types) or complex (structured) values
-* A special kind of [[Identity Attribute]] is called a [[Subject Relation]] whose value is a reference to another [[Digital Subject]] in the same or a different [[Context]]
-* Some [[Identity Attribute]]s are defined by the containing [[Context]]'s schema to allow multiple '''unique''' values. For example the attribute preferredBreakfast might have the values {spam, eggs}, but it could not have the values {spam, spam, spam, eggs, spam}.
 ==See Also==

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