<topicsubject> element identifies the subjects covered by a
topic or map.
In order to identify a primary subject, refer to the subject with the
<topicsubject> itself. Subjects can be identified by
(if defined in the scheme) or, if the subject definition topic exists, by
with ordinary topic references).
Additional secondary subjects can be specified by nested
See appendix for information about this element in OASIS document type shells.
+ map/topicref classify-d/topicsubject
In the following example, the map is classified as covering Linux as the primary subject; the
topic "Developing web applications" also covers the secondary web and development subjects. These
subjects (and their keys) are defined externally in a subject scheme map; in order to reference the
subject directly without the subject scheme map, the
@href attribute would be used
in place of
<map> <title>Working with Linux</title> <topicsubject keyref="linux"/> <!-- ... --> <topicref href="webapp.dita" navtitle="Developing web applications"> <topicsubject> <subjectref keyref="web"/> <subjectref keyref="development"/> </topicsubject> <!-- ... --> </topicref> <!-- ... --> </map>
The following attributes are available on this element: Universal attribute group, Link relationship attribute group (with a narrowed definition of
@href, given below),
@query from Topicref element attributes group, outputclass,
@keys. This element also uses
narrowed definitions of
@toc (given below) from
Attributes common to many map elements.
<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
@formatattribute to identify the kind of resource being referenced.
@processing-roleis "resource-only". Otherwise, the definition matches the one found in Attributes common to many map elements.
@tocis "no". See Attributes common to many map elements for a complete definition of
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