Difference between revisions of "Data Range"
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== Definition == | == Definition == | ||
| − | * A [[Data Range]] defines the | + | * A [[Data Range]] defines the range of values of an [[Attribute]] |
* A [[Data Range]] MUST have a base XML Schema type (e.g. String) | * 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: | * 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: | ||
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== Predefined [[Data Range]]s == | == Predefined [[Data Range]]s == | ||
The following are predefined in HOWL: | The following are predefined in HOWL: | ||
| − | # [[ | + | # [[ContextIdDataRange]] |
# [[NodeIdDatatype]] | # [[NodeIdDatatype]] | ||
Revision as of 22:25, 14 February 2008
Introduction
This page describes the concept of a Data Range.
Definition
- A Data Range defines the range of values 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: