XML Pocket Reference, 3rd Edition

Name

rng:grammar — Container for the definitions of named patterns

XML syntax example

<grammar xmlns="http://relaxng.org/ns/structure/1.0">

<start>
 <element name="cd">
  <attribute name="title"/>
  <optional>
   <attribute name="artist"/>
  </optional>
  <ref name="content"/>
 </element>
</start>

<define name="content">
 <element name="playlist">
  <oneOrMore>
   <element name="song"><text/></element>
  </oneOrMore>
 </element>
</define>

</grammar>

Compact syntax example

start = element cd {
 attribute title { text }, attribute artist { text }?,
 content
}
content = element playlist { element song { text }+ }

Parents

attribute, choice (( ) and |), define (name of pattern followed by =), element, except (-), group (( ) and ,), interleave (&), list, mixed, oneOrMore (+), optional (?), start (start followed by =), zeroOrMore (*)

Description

A grammar pattern acts as a container for define elements, which define named patterns, and for a start element, which specifies the pattern that must be matched in order for the grammar element to be matched. (A grammar pattern may also contain only a section of schema.) It is common to use a grammar pattern as the document element of a RELAX NG schema, and in the compact syntax, a grammar pattern is assumed if the schema consists of definitions using =.

See also

§4, §9, §13, define, start