- subjectScheme
The <subjectScheme> element is a specialization of <map>; it defines taxonomic subjects and controlled values.
- 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.
- hasInstance
The <hasInstance> element specifies that the contained subjects have an INSTANCE-OF relationship with the container subject. In an INSTANCE-OF hierarchy, the child subject is a specific entity or object and the parent subject is a type, kind, or class of entity or object.
- hasKind
The <hasKind> element specifies that the contained hierarchy expresses KIND-OF relationships between subjects.
- 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.
- hasPart
The <hasPart> element specifies that the contained hierarchy expresses PART-OF relationships between subjects.
- hasRelated
The <hasRelated> element identifies an associative relationship between the container subject and each of the contained subjects.
- enumerationdef
The <enumerationdef> element identifies one attribute and one or more categories that contain the controlled values for the enumeration. The @type attribute has a default value of "keys".
- elementdef
The <elementdef> element identifies an element to which an attribute is bound. If the <enumerationdef> element does not contain an <elementdef> element, the enumeration is bound to the attribute in all elements.
- attributedef
The <attributedef> element specifies the attribute that is bound to a set of controlled values. This binding restricts the permissible values for the attribute to those that are contained in the set of controlled values.
- defaultSubject
The <defaultSubject> element is used within an attribute enumeration to set the default value for the attribute in cases where no value is specified for the attribute. The default subject must be one of the controlled values that are bound to the attribute.
- subjectHead
The <subjectHead> element provides a heading for a group of subjects, for use if the scheme is displayed. For instance, a ►scheme might◄ be displayed to let a user select subjects as part of faceted browsing. The <subjectHead> element itself does not reference a file and cannot be referenced as a key, so it does not define any controlled values.
- subjectHeadMeta
The <subjectHeadMeta> element allows a navigation title and short description to be associated with a subject heading.
- subjectdef
The <subjectdef> element defines a subject (also known as a controlled value) within a subject scheme. The @keys attribute specified on the <subjectdef> element assigns a key to the subject. A subject with a key can be addressed using a @keyref attribute.
- relatedSubjects
The <relatedSubjects> element establishes associative relationships between each child subject and every other child subject (unless the association is restricted by the @linking attribute of the subjects).
- subjectRelTable
The <subjectRelTable> element is a specialized relationship table which establishes relationships between the subjects in different columns of the same row. This element provides an efficient way to author non-hierarchical relationships between subjects. Tools (such as search tools) that use subject relationships to find related content might use these associative relationships in a similar way to the hierarchical relationships.
- subjectRelHeader
The <subjectRelHeader> element specifies the roles played by subjects in associations.
- subjectRel
The <subjectRel> element contains a set of subjects that are related in some manner. Each group of subjects is contained in a <subjectRole> element; the associations between different columns in the same row are evaluated in the same way as those in a <relrow> (from which <subjectRel> is specialized) but define relationships between the subjects instead of links between topic documents.
- subjectRole
The <subjectRole> element, when used within a <subjectRel> element, contains a set of subjects that are related to other subjects in the same row of the current <subjectRelTable>. By default, no relationship is defined between multiple subjects in the same <subjectRole> element. When used within the <subjectRelHeader>, the <subjectRole> element defines the category of subject or relationship provided by that column.