The map element describes the relationships among a set of resources, such as DITA topics. Maps consist of references to topics, maps, and other resources organized into hierarchies, groups, and tables. Maps express these relationships in a single common format that can be used for different outputs.
The containing element for a map is the map element. Within the map, use the topicref element to add and organize references to the topics, and the topicgroup and reltable elements to provide non-hierarchical relationships. You can use the map element to set default attribute values for all topicref elements in the map.
- Hierarchical (Parent/Child). Nested topics create a hierarchical relationship. The topic that does the nesting is the parent, and the topics that are nested are the children.
- Ordered. Child topics can be labeled as having an ordered relationship, which means they are referenced in a definite sequence.
- Family. Child topics can be labeled as having a family relationship, which means they all refer to each other.
When rendering a map, processors might make use of these relationships, such as to create a Table of Contents (TOC), aggregate topics into a PDF document, or create links between topics in output.
The title element can optionally be used to provide a title for the map (the title element is preferred over the title attribute). In some scenarios the title is purely informational, and is present as an aid to the author. In other scenarios it might be useful or even required. For example, if a map is converted to Eclipse Help, the Eclipse system will require a title for the resulting table of contents. In the bookmap specialization of map, the title element provides a title for the book represented by that map. In a map referenced by another map, the title might be discarded as topics from the submap are aggregated into a larger publication.
See appendix for information about this element in OASIS document type shells.
In this example, there are six topicref elements. They are nested and have a hierarchical relationship. The file bats.dita is the parent topic and the other topics are its children. The hierarchy could be used to generate a PDF, a navigation pane in an information center, a summary of the topics, or related links between the parent topic and its children.
<map id="mybats"> <title>Bats</title> <topicref href="bats.dita" type="topic"> <topicref href="batcaring.dita" type="task"></topicref> <topicref href="batfeeding.dita" type="task"></topicref> <topicref href="batsonar.dita" type="concept"></topicref> <topicref href="batguano.dita" type="reference"></topicref> <topicref href="bathistory.dita" type="reference"></topicref> </topicref> </map>
The following attributes are available on this element: Universal attribute group (with a narrowed definition of id, given below), Attributes common to many map elements, Architectural attribute group, outputclass, and the attributes defined below. This element also uses type, scope, and format from Link relationship attribute group.
- Allows an ID to be specified for the map. Note that maps do not require IDs (unlike topics), and the map ID is not included in references to elements within a map. This attribute is defined with the XML Data Type ID.
- Identifies a location within another map document where this map will be anchored. Resolution of the map is deferred until the final step in the delivery of any rendered content. For example, anchorref="map1.ditamap#a1" allows the map with anchorref to be pulled into the location of the anchor point "a1" inside map1.ditamap when map1.ditamap is rendered for delivery.
- An identifying title for the map. May be used or ignored, depending on the capabilities of the display mechanism. Note that beginning with DITA 1.1, the map can include a title element, which is preferred over the title attribute.