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.


- map/topicref subjectScheme/hasNarrower


This example specifies that Planting Roses is a narrower subject category than Horticulture, although it is part of the Horticulture subject area.

    <subjectdef keys="horticulture" navtitle="Horticulture">
      <subjectdef keys="plantrose"  navtitle="Planting Roses"/>


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 .

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.