DocBook Element Reference. The description of each element in this reference is divided into the following sections: Each element synopsis begins with a concise description of the elements it can contain. This description is in DTD "content model" syntax, with all parameter entities expanded. Content models are the way that DTDs describe the name, number, and order of other elements that may be used inside an element. The primary feature of content model syntax is that it is concise, but this conciseness comes at the cost of legibility until you are familiar with the syntax. There are six components to content model syntax: element names, keywords, repetitions, sequences, alternatives, and groups.
Element names An element name in a content model indicates that an element of that type may (or must) occur at that position. A content model of Para indicates that the element must contain a single paragraph. Keywords There are two keywords that occur in the content models of DocBook elements: EMPTY, and #PCDATA. Repetitions. Crash-course. DocBook. Jaxe, votre éditeur XML. World Wide Web Consortium (W3C) DocBook.org.