hasNarrower
For subjects within the hasNarrower element, the container subject is more general than each of the contained subjects. That is, this element makes the default hierarchical relationship explicit, although the way in which a relationship is narrower is not specified.
Content models
See appendix for information about this element in OASIS document type shells.
Inheritance
- map/topicref subjectScheme/hasNarrower
Example 196. Example
This example specifies that Planting Roses is a narrower subject category than Horticulture, although it is part of the Horticulture subject area.
<subjectScheme>
<hasNarrower>
<subjectdef keys="horticulture" navtitle="Horticulture">
<subjectdef keys="plantrose" navtitle="Planting Roses"/>
</subjectdef>
</hasNarrower>
</subjectScheme>
Attributes
The following attributes are available on this element:
Universal attribute group,
Link relationship attribute group (with a narrowed definition of
href, given below),
processing-role from
Attributes common to many map elements,
navtitle from
Topicref element attributes group,
outputclass,
keys, and
keyref.
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.
Parent topic