schemeref
A schemeref element references another subject scheme map. Typically, the referenced subject scheme defines a base set of controlled values; the referencing map then extends the base set of controlled values. The values specified in the subject scheme maps are merged; the result is equivalent to specifying all of the values in a single map.
Content models
See appendix for information about this element in OASIS document type shells.
Inheritance
- map/topicref subjectScheme/schemeref
Attributes
The following attributes are available on this element:
Universal attribute group,
Link relationship attribute group (with narrowed definitions of
href,
format, and
type, given below),
navtitle and
query 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.
format
On this element the
format attribute sets a default value of "ditamap", because the purpose of the element is to reference a ditamap document. Otherwise, the attribute is the same as described in
Link relationship attribute group.
type
Describes the target of a reference. For the schemeref element, this value defaults to "scheme", because the element is expected to point to another subject scheme.
Parent topic