3.1.5.1.3 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.

Contains

Doctype

Content model

subjectScheme

( (topicmeta) (optional) then (data or data-about or subjectdef or subjectHead or topicref or (anchorref or keydef or mapref or topicgroup or topichead or topicset or topicsetref) ) (any number) )

Contained by

Doctype

Content model

subjectScheme

subjectScheme, subjectdef

Inheritance

- map/topicref subjectScheme/hasInstance

Example

This example specifies that New York City, Reykjavik, and Moscow are each specific instances of a city.

<subjectScheme>
  <hasInstance>
    <subjectdef keys="city" navtitle="City">
      <subjectdef keys="nyc"       navtitle="New York City"/>
      <subjectdef keys="reykjavik" navtitle="Reykjavik"/>
      <subjectdef keys="moscow"    navtitle="Moscow"/>
    </subjectdef>
  </hasInstance>
</subjectScheme>
Attributes

Name

Description

Data Type

Default Value

Required?

navtitle

Specifies the title of the topic as it will appear in the navigation or tables of contents that are generated from the map. Beginning with DITA 1.2, the preferred way to specify the navigation title in a map is with the navtitle element, available inside the topicmeta element.

CDATA

#IMPLIED

No

href

A pointer to the resource represented by the <topicref>. See 3.4.2.1 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.

CDATA

#IMPLIED

No

keys

Introduces one or more global identifiers for a resource referenced from a map. See 3.4.2.2 The keys attribute for details on how to use the keys attribute.

NMTOKEN

#IMPLIED

No

processing-role

Describes the processing role of the referenced topic. The processing default is "normal".

normal

Normal topic that is a readable part of the information.

resource-only

The topic is used as a resource for processing purposes, but is not a readable unit of information on its own. This topic should not be included in a rendered table of contents, and the topic should not be rendered on its own.

(normal | resource-only | -dita-use-​conref-​target)

#IMPLIED

No

scope

The scope attribute identifies the closeness of the relationship between the current document and the target resource. See 3.4.2.10 The scope attribute for more information on values.

(local | peer | external | -dita-use-​conref-​target)

#IMPLIED

No

format

The format attribute identifies the format of the resource being referenced. See 3.4.2.9 The format attribute for details on supported values.

CDATA

#IMPLIED

No

type

Describes the target of a reference. See 3.4.2.8 The type attribute for detailed information on supported values and processing implications.

CDATA

#IMPLIED

No

univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups)

A set of related attributes, described in 3.4.1.3 univ-atts attribute group

     

global-atts attribute group (xtrf, xtrc)

A set of related attributes, described in 3.4.1.2 global-atts attribute group

     

class, outputclass, keyref

Class and outputclass are described in 3.4.1.9 Other common DITA attributes

     

Previous Topic:  3.1.5.1.2 schemeref

Next Topic:  3.1.5.1.4 hasKind

Parent Topic:  3.1.5.1 Subject scheme maps

Sibling Topics:

3.1.5.1.1 subjectScheme

3.1.5.1.2 schemeref

3.1.5.1.4 hasKind

3.1.5.1.5 hasNarrower

3.1.5.1.6 hasPart

3.1.5.1.7 hasRelated

3.1.5.1.8 enumerationdef

3.1.5.1.9 elementdef

3.1.5.1.10 attributedef

3.1.5.1.11 defaultSubject

3.1.5.1.12 subjectHead

3.1.5.1.13 subjectHeadMeta

3.1.5.1.14 subjectdef

3.1.5.1.15 relatedSubjects

3.1.5.1.16 subjectRelTable

3.1.5.1.17 subjectRelHeader

3.1.5.1.18 subjectRel

3.1.5.1.19 subjectRole