The <subjectdef> element defines a subject (also known as a controlled value) within a scheme. To make the subject easy to identify, a <subjectdef> may use a keys attribute to assign a key to the subject. A subject with a key can be identified elsewhere with a keyref. The <subjectdef> may use a navtitle element or attribute to supply a label for the subject. The <subjectdef> may also refer to a topic that captures the consensus definition for the subject.
As with normal <topicref> processing, when the <subjectdef> element specifies a navtitle and refers to a topic, processors should use the actual topic title in place of the navtitle. When the navtitle is preferred as a subject label, the <subjectdef> element must have the locktitle attribute set to "yes".
Doctype | Content model |
---|---|
subjectScheme | ( (topicmeta) (optional) then (data or data-about or hasInstance or hasKind or hasNarrower or hasPart or hasRelated or subjectdef or subjectHead or topicref or (anchorref or keydef or mapref or topicgroup or topichead or topicset or topicsetref) ) (any number) ) |
Doctype | Content model |
---|---|
subjectScheme | subjectScheme, hasNarrower, hasKind, hasPart, hasInstance, hasRelated, subjectdef, subjectHead, enumerationdef, relatedSubjects, subjectRole |
<subjectScheme> <!-- Pull in a scheme that defines unix OS values --> <schemeref href="unixOS.ditamap"/> <!-- Define new OS values that are merged with those in the unixOS scheme --> <subjectdef keys="os"> <subjectdef keys="linux"/> <subjectdef keys="mswin"/> <subjectdef keys="zos"/> </subjectdef> <!-- Define application values --> <subjectdef keys="app" navtitle="Applications"> <subjectdef keys="apacheserv" href="subject/apache.dita"/> <subjectdef keys="mysql" href="subject/sql.dita"/> </subjectdef> <!-- Define an enumeration of the platform attribute, equal to each value in the OS subject. This makes the following values valid for the platform attribute: linux, mswin, zos --> <enumerationdef> <attributedef name="platform"/> <subjectdef keyref="os"/> </enumerationdef> <!-- Define an enumeration of the otherprops attribute, equal to each value in the application subjects. This makes the following values valid for the otherprops attribute: apacheserv, mysql --> <enumerationdef> <attributedef name="otherprops"/> <subjectdef keyref="app"/> </enumerationdef> </subjectScheme>
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 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 The keys attribute for details on how to use the keys attribute. | NMTOKEN | #IMPLIED | No |
keyref | Keyref provides a redirectable reference based on a key defined within a map. See The keyref attribute for information on using this attribute. | CDATA | #IMPLIED | No |
processing-role | Describes the processing role of the referenced topic. The
processing default is "normal".
If the value is not specified locally, but
is specified on an ancestor, the value will cascade from the closest
ancestor.
|
(normal | resource-only | -dita-use-conref-target) | #IMPLIED | No |
query | This attribute is deprecated. It may be removed in the future. | CDATA | #IMPLIED | No |
copy-to | Use the copy-to attribute on the
<topicref> element to provide a different file name
for a particular instance of the topic in the map (for example, to separate out
the different versions of the topic, rather than combining them on output). The
links and navigation associated with that instance will point to a copy of the
topic with the file name you specified.
Use the <linktext> and <shortdesc> in the <topicref>'s <topicmeta> to provide a unique name and short description for the new copy. |
CDATA | #IMPLIED | No |
collection-type | Collection types describe how links relate to each other.
The processing default is "unordered", although no default is specified in the
DTD or Schema.
Usage of the collection-type attribute on <reltable> and <relcolspec> is currently undefined and reserved for future use. |
(unordered | sequence | choice | family | -dita-use-conref-target) | #IMPLIED | No |
type | Describes the target of a reference. See The type attribute for detailed information on supported values and processing implications. | CDATA | #IMPLIED | No |
scope | The scope attribute identifies the closeness of the relationship between the current document and the target resource. See The scope attribute for more information on values. | (local | peer | external | -dita-use-conref-target) | #IMPLIED | No |
locktitle | If locktitle is set to "yes", the
<navtitle> element or @navtitle attribute is used if it is present.
Otherwise, the navtitle is ignored and the navigation title is retrieved from
the referenced file.
Note: The @navtitle attribute is
deprecated in favor of the <navtitle> element. When both a
<navtitle> element and a navtitle attribute are specified, the
<navtitle> element should be used.
|
(yes | no | -dita-use-conref-target) | #IMPLIED | No |
format | The format attribute identifies the format of the resource being referenced. See The format attribute for details on supported values. | CDATA | #IMPLIED | No |
linking | Defines some specific linking characteristics of a
topic's current location in the map.
If the value is not specified locally, but
is specified on an ancestor, the value will cascade from the closest
ancestor.
|
(targetonly | sourceonly | normal | none | -dita-use-conref-target) | #IMPLIED | No |
toc | Specifies whether a topic appears in the table of contents (TOC). If the value is not specified locally, but is specified on an ancestor, the value will cascade from the closest ancestor. | (yes | no | -dita-use-conref-target) | #IMPLIED | No |
univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups) | A set of related attributes, described in univ-atts attribute group | |||
global-atts attribute group (xtrf, xtrc) | A set of related attributes, described in global-atts attribute group | |||
class, outputclass | Common attributes described in Other common DITA attributes |
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OASIS DITA Version 1.2 -- OASIS Standard, 1 December 2010
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