###### 3.1.5.2.3 topicsubject

The <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, using the keys or The subjects can be identified by keys (if defined in the scheme) or, if the subject definition topic exists, by href (as with ordinary topic references).

Additional secondary subjects can be specified by nested <subjectref> elements.

###### Contains

Doctype | Content model
classifyMap | ( (topicmeta) (optional) then (data or data-about or subjectref or topicref or (topicsubject or topicapply) or (anchorref or keydef or mapref or topicgroup or topichead or topicset or topicsetref) ) (any number) )

###### Contained by

Doctype | Content model
classifyMap | map, topicref, relcolspec, relcell, topichead, topicgroup, anchorref, topicset, topicsetref, keydef, topicsubject, topicapply, topicCell, subjectCell

###### Inheritance

+ map/topicref classify-d/topicsubject

###### Example

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 keyref.

    <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>

###### Attributes

Name | Description | Data Type | Default Value | Required?
navtitle | Specifies the title of the topic as it will appear in the navigation or tables of contents that are generated from the map. Beginning with DITA 1.2, the preferred way to specify the navigation title in a map is with the navtitle element, available inside the topicmeta element. | CDATA | #IMPLIED | No
href | A pointer to the resource represented by the <topicref>. See 3.4.2.1 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. | CDATA | #IMPLIED | No
keys | Introduces one or more global identifiers for a resource referenced from a map. See 3.4.2.2 The keys attribute for details on how to use the keys attribute. | NMTOKEN | #IMPLIED | No
keyref | Keyref provides a redirectable reference based on a key defined within a map. See 3.4.2.3 The keyref attribute for information on using this attribute. | CDATA | #IMPLIED | No
query | This attribute is deprecated. It may be removed in the future. | CDATA | #IMPLIED | No
type | Describes the target of a reference. See 3.4.2.8 The type attribute for detailed information on supported values and processing implications. | CDATA | #IMPLIED | No
processing-role | Describes the processing role of the referenced topic. The default for this attribute on this element is "resource-only". normal Normal topic that is a readable part of the information. resource-only The topic is used as a resource for processing purposes, but is not a readable unit of information on its own. This topic should not be included in a rendered table of contents, and the topic should not be rendered on its own. | (normal | resource-only | -dita-use-​conref-​target) | resource-only | No
scope | The scope attribute identifies the closeness of the relationship between the current document and the target resource. See 3.4.2.10 The scope attribute for more information on values. | (local | peer | external | -dita-use-​conref-​target) | #IMPLIED | No
format | The format attribute identifies the format of the resource being referenced. See 3.4.2.9 The format attribute for details on supported values. | CDATA | #IMPLIED | No
toc | Specifies whether a topic appears in the table of contents (toc); on this element the default is no. This value defaults to no for elements such as reltable, which typically cannot appear in the toc, and for elements such as glossref that generally are not desired in the toc. | (yes | no | -dita-use-​conref-​target) | "no" | No
univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups) | A set of related attributes, described in 3.4.1.3 univ-atts attribute group |  |  |
global-atts attribute group (xtrf, xtrc) | A set of related attributes, described in 3.4.1.2 global-atts attribute group |  |  |
class, outputclass | Common attributes described in 3.4.1.9 Other common DITA attributes |  |  |

Previous Topic: 3.1.5.2.2 topicapply

Next Topic: 3.1.5.2.4 topicSubjectTable

Parent Topic: 3.1.5.2 Classification domain elements

Sibling Topics:

3.1.5.2.1 subjectref

3.1.5.2.2 topicapply

3.1.5.2.4 topicSubjectTable

3.1.5.2.5 topicSubjectHeader

3.1.5.2.6 topicSubjectRow

3.1.5.2.7 topicCell

3.1.5.2.8 subjectCell