RELAX NG by Eric van der Vlist will be published by O'Reilly & Associates (ISBN: 0596004214)

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pattern?
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Name

pattern? — optional pattern

Class:

pattern

Synopsis

pattern "?"

May be included in:

(pattern), attribute, datatypeName param exceptPattern, element, list, mixed, pattern&pattern, pattern*, pattern+, pattern,pattern, pattern?, pattern|pattern.

XML syntax equivalent:

optional

Description:

A pattern qualified as optional is optional. It must be matched zero or one times.

Example:


    element died {text}?
 
  attribute see-also {list {token, token?, token?, token?}}

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All text is copyright Eric van der Vlist, Dyomedea. During development, I give permission for non-commercial copying for educational and review purposes. After publication, all text will be released under the Free Software Foundation GFDL.

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