subjectref
The subjectref element identifies a subject to classify content. The subjectref can identify the subject with a keyref attribute (if the scheme has a subjectdef with a keys attribute that assigns a key to the subject) or an href attribute (if the scheme is not available and a topic exists that defines the subject).
Content models
See appendix for information about this element in OASIS document type shells.
Inheritance
+ map/topicref classify-d/subjectref
Example 211. Example
In the following example, the map is classified as covering the Linux subject and the "Developing web applications" topic as covering the 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
The following attributes are available on this element:
Universal attribute group,
Link relationship attribute group (with a narrowed definition of
href, given below),
navtitle and
query from
Topicref element attributes group,
outputclass,
keyref, and
keys. This element also uses
collection-type,
linking, and narrowed definitions of
processing-role and
toc (given below), from
Attributes common to many map elements.
href
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.
processing-role
toc
Specifies whether a topic appears in the table of contents (TOC). If the value is not specified locally, but is specified on an ancestor, the value will cascade from the closest ancestor. On this element the default value for
toc is "no". See
Attributes common to many map elements for a complete definition of
toc.
Parent topic