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.