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Difference between revisions of "Data Range"
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== Definition == | == Definition == | ||
* The datatype of a literal (simple) value of an [[Attribute]] | * The datatype of a literal (simple) value of an [[Attribute]] | ||
| + | * An AVM MAY specialize: | ||
| + | ** a base XML Schema type (e.g. String) for literal AVMs | ||
| + | ** OR a complex AVM | ||
| + | ** OR another AVM | ||
| + | * An AVM defines a set of constraints on its value(s) including: | ||
| + | ** Value must be one of {"red", "green", "blue"} | ||
| + | ** Syntax constraints (e.g. regular expression) | ||
| + | ** ranges (e.g. less than 5, more than 100) | ||
| + | ** matching rules | ||
== Examples == | == Examples == | ||
| − | * | + | * An [[Attribute]] might have a value whose [[Attribute Value Datatype]] was (XML Schema) string |
| − | * | + | * An [[Attribute]] might have a value whose [[Attribute Value Datatype]] was defined in the [[Context]]s schema as "telephone number". This telephone number type might have a base type of (XML Schema) string, but might also have an XML Schema ''pattern'' restriction that constrained its syntax to be value in North America for auto-dialing (e.g. it is of the form (NNN)-NNN-NNNN) |
| + | |||
== See Also == | == See Also == | ||
| + | * [[Attribute Model]] | ||
* [[Higgins Global Graph]] | * [[Higgins Global Graph]] | ||
== Links == | == Links == | ||
* [http://eclipse.org/higgins Higgins Home] | * [http://eclipse.org/higgins Higgins Home] | ||
Revision as of 21:22, 7 February 2008
Introduction
This page describes the concept of an Attribute Value Datatype.
Definition
- The datatype of a literal (simple) value of an Attribute
- An AVM MAY specialize:
- a base XML Schema type (e.g. String) for literal AVMs
- OR a complex AVM
- OR another AVM
- An AVM defines a set of constraints on its value(s) including:
- Value must be one of {"red", "green", "blue"}
- Syntax constraints (e.g. regular expression)
- ranges (e.g. less than 5, more than 100)
- matching rules
Examples
- An Attribute might have a value whose Attribute Value Datatype was (XML Schema) string
- An Attribute might have a value whose Attribute Value Datatype was defined in the Contexts schema as "telephone number". This telephone number type might have a base type of (XML Schema) string, but might also have an XML Schema pattern restriction that constrained its syntax to be value in North America for auto-dialing (e.g. it is of the form (NNN)-NNN-NNNN)