RELAX NG

Glossary

A

ambiguous

A pattern is ambiguous when a fragment of an instance document can be valid against using several alternatives in its choice patterns. RELAX NG allows ambiguous patterns, but they can be a problem for annotation and datatype assignment.

C

chameleon design

Specifying a namespace in include, externalRef, or parentRef to give a namespace to grammars or patterns defined without a namespace is known as chameleon design, because the imported grammar or pattern takes on the new namespace like a chameleon takes on the color of the environment in which it is placed.

character class

In a regular expression, a character class is an atom that matches a set of characters. Character classes may be classical Perl character classes, Unicode character classes, or user-defined character classes.

classical Perl character class

A set of character classes designated by a single letter, for which upper- and lowercases of the same letter are complementary (for instance, \d is all the decimal digits, and \D is all the characters that aren’t decimal digits).

compositor

A compositor is a pattern that can be used to combine other patterns. RELAX NG has three basic compositors: group, choice, and interleave. A fourth compositor, mixed, is a shortcut for interleave with an embedded text pattern.

content model

A description of the structure of child elements and text nodes (independent of attributes). The content model is simple when there is a text node but no elements, complex when there are element ...