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RELAX NG: the power is in the patterns. (Schema Language).

Publication: XML Journal
Publication Date: 01-JUL-02 		Format: Online - approximately 1125 words
Delivery: Immediate Online Access
Full Article Title: RELAX NG: the power is in the patterns. (Schema Language).(Brief Article)

Article Excerpt
Schema languages are languages that allow you to specify the structure of XML instance documents. RELAX NG (see www.relaxng. org) is an XML schema language that is considered to be simple, yet powerful. This article gives an overview of an important concept of the RELAX NG schema language called patterns. The power of RELAX NG can be found in its patterns.

Schema languages also describe the allowed names of elements and attributes that are found in XML instance documents. And they allow you to specify element ordering, occurrence, and allowed content, like simple text, or datatypes, like integers. Some examples of schema languages are W3C XML Schema, RELAX NG, Schematron, and DTD.

RELAX NG differs from other schema languages in that it's built around the concept of patterns. To understand the power of RELAX NG, you must first understand the basic RELAX NG patterns and how they can be combined.

Let's begin by taking a look at the following XML instance document:

Patterns are fun Tom Gaven This...

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