The <preface> element references a topic or map containing introductory information about a book, such as the purpose and structure of the document.

Content models

See appendix for information about this element in OASIS document type shells.


- map/topicref bookmap/preface


See the example in bookmap.


The following attributes are available on this element: Universal attribute group, Link relationship attribute group (with a narrowed definition of @href, given below), Attributes common to many map elements, @navtitle and @copy-to from Topicref element attributes group, outputclass, and @keyref.

A pointer to the resource represented by the <topicref>. See The href attribute for detailed information on supported values and processing implications. References to DITA content cannot be below the topic level: that is, you cannot reference individual elements inside a topic. References to content other than DITA topics should use the @format attribute to identify the kind of resource being referenced.

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