optional

optional

XML Elements

RelaxNG Reference : optional [Elements]

a simple schema language for XML

DocBook 5.0 Reference : optional [Elements]

an XML schema for describing books and articles

XML Attributes

TEI - version 5 - Full Reference : optional [Attributes]

representation of texts in digital form

External resources

Relax NG

http://books.xmlschemata.org

Introducing the Compact Syntax

http://books.xmlschemata.org

DocBook.org

http://docbook.org

ISO/IEC 19757-2 standard

http://standards.iso.org

DocBook.org

http://www.docbook.org

GNU Free Documentation License

http://www.docbook.org

DocBook 5.0: The Definitive Guide

http://www.docbook.org

Free Documentation Licence

http://www.gnu.org

DocBook Technical Committee of OASIS

http://www.oasis-open.org

http://www.relaxng.org/

http://www.relaxng.org

RELAX NG Compact Syntax Tutorial

http://www.relaxng.org

RelaxNG specification

http://www.relaxng.org

TEI Guidelines

http://www.tei-c.org

TEI Roma generator

http://www.tei-c.org

TEI: Text Encoding Initiative

http://www.tei-c.org

James Clark's software

http://www.thaiopensource.com