Skip to main content
Jump to: navigation, search

Data Range

Revision as of 20:38, 12 February 2008 by Drummond.reed.cordance.net (Talk | contribs) (fixed references and wordsmithing)

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:

  1. ContextIdDatatype
  2. NodeIdDatatype

See Also

Links

Copyright © Eclipse Foundation, Inc. All Rights Reserved.