Map group elements

The map group domain elements define, group, or reference content. Many of the map group elements are convenience elements, which means that they simply make it easier for an author to make use of existing functions.

For example, the <topichead> element allows a map to specify a heading without allowing a reference to a topic. While a <topicref> element may accomplish the same thing by creating a title and leaving off the href attribute, the <topichead> element simply makes the intent clearer and prevents the accidental inclusion of an href attribute.

3.1.2.2.1 anchorref
The <anchorref> element is used to reference an <anchor> element in a map. The contents of an <anchorref> element are rendered both in the original authored location and at the location of the referenced <anchor> element. The referenced <anchor> element may be defined in the current map or another map. When possible, this integration is done when displaying the map with <anchor> to an end user.
3.1.2.2.2 keydef
The <keydef> element is a convenience element that is used to define keys without any of the other effects that occur when using a <topicref> element: no content is included in output, no title is included in the table of contents, and no linking or other relationships are defined. The <keydef> element is not the only way to define keys; its purpose is to simplify the process by defaulting several attributes to achieve the described behaviors.
3.1.2.2.3 mapref
The <mapref> element is a convenience element that is equivalent to a <topicref> element with the format attribute set to "ditamap". The hierarchy of the referenced map is merged into the container map at the position of the reference, and the relationship tables of the child map are added to the parent map.
3.1.2.2.4 topicgroup
The <topicgroup> element groups <topicref> elements for common treatment without affecting the structural hierarchy of the map, as opposed to nesting <topicref> elements, which does imply a structural hierarchy. The <topicgroup> element can provide linking relationships and shared, inherited attributes to the set of elements that it contains without affecting the resulting table of contents or navigation.
3.1.2.2.5 topichead
The <topichead> element provides a title-only entry in a navigation map, which should appear as a heading when the map is rendered as a table of contents. In print contexts it should also appear as a heading in the rendered content.
3.1.2.2.6 topicset
The <topicset> element defines a complete unit of content that can be reused in other DITA maps or other <topicset> elements. The <topicset> element can be especially useful for task composition in which larger tasks are composed of smaller tasks. The id attribute on a <topicset> is required, which ensures that the complete unit is available for reuse in other contexts.
3.1.2.2.7 topicsetref
The <topicsetref> element references a <topicset> element. The referenced <topicset> element can be defined in the current map or in another map.

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3.1.2.2 Map group elements