The DocBook 4 Document Type

DocBook is a very popular set of tags for describing books, articles, and other prose documents, particularly technical documentation.

A file is considered to be a DocBook 4 document when one of the following conditions are true:

• The root element name is book or article.
• The PUBLIC ID of the document contains the string -//OASIS//DTD DocBook XML.

The default schema that is used if one is not detected in the DocBook 4 file is docbookxi.dtd and it is stored in [OXYGEN_DIR]/frameworks/docbook/4.5/dtd/.

The default XML catalog, catalog.xml, is stored in [OXYGEN_DIR]/frameworks/docbook/.