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Difference between revisions of "Data Range"
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== Introduction == | == Introduction == | ||
| − | This page describes the concept of | + | This page describes the concept of a [[Data Range]]. |
== Definition == | == Definition == | ||
| − | * | + | * A [[Data Range]] defines the datatype and [optionally] constraints on the value of an [[Attribute]] |
| − | * | + | * A [[Data Range]] MUST have a base XML Schema type (e.g. String) |
| − | * | + | * A [[Data Range]] MAY include a set of constraining "facets" on its value(s). The names and semantics of these facets are taken from the [http://www.w3.org/TR/xmlschema-2/#rf-facets Constraining Facets] section of XML Schema Part 2. They include: |
| − | ** | + | ** Enumeration (e.g., must be one of {"red", "green", "blue"}) |
| − | ** | + | ** Pattern (e.g. regular expression) |
| − | ** | + | ** Bounding (e.g. less than 5, more than 100) |
| − | + | See the [http://www.w3.org/TR/xmlschema-2/#rf-facets Constraining Facets] section of XML Schema Part 2 for detailed specifications and examples. | |
== Examples == | == Examples == | ||
| − | * An [[Attribute]] might have a value whose [[Data Range]] was defined in the [[Context]] | + | * An [[Attribute]] might have a value whose [[Data Range]] was defined in the schema of its [[Context]] as "telephone number". This telephone number [[Data Range]] might have a base type of [http://www.w3.org/TR/xmlschema-2/#string string] as defined by XML Schema Part 2, but for use in auto-dialing, it might also have a [http://www.w3.org/TR/xmlschema-2/#rf-pattern pattern] facet that constrains the syntax to be valid phone number in North American (e.g. it is of the form (NNN)-NNN-NNNN). |
| − | == Predefined [[Data | + | == Predefined [[Data Range]]s == |
The following are predefined in HOWL: | The following are predefined in HOWL: | ||
# [[ContextIdDatatype]] | # [[ContextIdDatatype]] | ||
# [[NodeIdDatatype]] | # [[NodeIdDatatype]] | ||
| − | |||
== See Also == | == See Also == | ||
| + | * [[Attribute]] | ||
* [[Higgins Global Graph]] | * [[Higgins Global Graph]] | ||
== Links == | == Links == | ||
* [http://eclipse.org/higgins Higgins Home] | * [http://eclipse.org/higgins Higgins Home] | ||
Revision as of 20:38, 12 February 2008
Introduction
This page describes the concept of a Data Range.
Definition
- A Data Range defines the datatype and [optionally] constraints on the value of an Attribute
- A Data Range MUST have a base XML Schema type (e.g. String)
- A Data Range MAY include a set of constraining "facets" on its value(s). The names and semantics of these facets are taken from the Constraining Facets section of XML Schema Part 2. They include:
- Enumeration (e.g., must be one of {"red", "green", "blue"})
- Pattern (e.g. regular expression)
- Bounding (e.g. less than 5, more than 100)
See the Constraining Facets section of XML Schema Part 2 for detailed specifications and examples.
Examples
- An Attribute might have a value whose Data Range was defined in the schema of its Context as "telephone number". This telephone number Data Range might have a base type of string as defined by XML Schema Part 2, but for use in auto-dialing, it might also have a pattern facet that constrains the syntax to be valid phone number in North American (e.g. it is of the form (NNN)-NNN-NNNN).
Predefined Data Ranges
The following are predefined in HOWL: