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Difference between revisions of "Attribute"
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==Definition== | ==Definition== | ||
| − | * An Attribute | + | * An Attribute defines a property of an [[Entity]] or a [[Context]]. |
| − | * An Attribute has a URI-valued type | + | * An Attribute has a URI-valued type |
* An Attribute has one or more values | * An Attribute has one or more values | ||
| − | * The values may be literal | + | * The values of an Attribute may be literal datatypes (defined by a sub-set of XML Schema literal types) or complex (structured) datatypes |
== Details == | == Details == | ||
Revision as of 16:15, 31 January 2008
Definition
- An Attribute defines a property of an Entity or a Context.
- An Attribute has a URI-valued type
- An Attribute has one or more values
- The values of an Attribute may be literal datatypes (defined by a sub-set of XML Schema literal types) or complex (structured) datatypes
Details
- A special kind of Identity Attribute is called a Relation whose value is a reference to another Digital Subject in the same or a different Context
- Some Identity Attributes 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}.
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.
- surname = "Smith"
The surname Attribute in the example above might have a type of http://openschemas.org/2006/person/surname. The schema associated with the containing Context provides metadata about this URI.
This same physical person Bob Smith might also be 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"