Language reference : Base architecture : Classification elements : Subject scheme maps : attributedef
The <attributedef> element specifies the attribute to which a set of controlled values from a subject scheme map are to be applied.
Note: These models represent only the default document types distributed by OASIS. Actual content models will differ with each new document type.
Content model
( (data or data-about) (any number) )
Contained by
Content model
- topic/data subjectScheme/attributedef
Example 167. Example
In this example, enumerations are specified for the platform and otherprops attributes. Note that the enumeration identifies a category of values; the values within the category are valid, while the category itself is not a valid value. For example, in the code sample here, the platform attribute is associated with the enumeration for the category "os"; all values within the "os" category are thus valid on the platform attribute, while the value "os" itself is not.
<!-- 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"/>
<!-- Define application values -->
<subjectdef keys="app" navtitle="Applications">
<subjectdef keys="apacheserv" href="subject/apache.dita"/>
<subjectdef keys="mysql" href="subject/sql.dita"/>

<!-- 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 -->
<attributedef name="platform"/>
<subjectdef keyref="os"/>
<!-- 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 -->
<attributedef name="otherprops"/>
<subjectdef keyref="app"/>
Data Type
Default Value
Defines an attribute that will take a set of enumerated values.
id-atts attribute group (id, conref, conrefend, conaction, conkeyref)
A set of related attributes, described in id-atts attribute group
The modification status of the current element.
new | changed | deleted | unchanged | -dita-use-​conref-​target
Indicates whether the content of the element should be translated or not. The DITA architectural specification contains a list of each OASIS DITA element and its common processing default for the translate value.
A generic attribute that has no specific purpose. It is intended to act as a base for specialized attributes that have a simple value syntax like the conditional processing attributes (one or more alphanumeric values separated by whitespace), but is not itself a filtering or flagging attribute. The attribute takes a space-delimited set of values. However, when acting as a container for generalized attributes, the content model will be more complex; see Attribute generalization for more details.
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