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.
Doctype Content model
subjectScheme ( (data or data-about) (any number) )

Contained by

Doctype Content model
subjectScheme enumerationdef


- topic/data subjectScheme/attributedef


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"/>


Name Description Data Type Default Value Required?
name Defines an attribute that will take a set of enumerated values. CDATA #REQUIRED Yes
id-atts attribute group (id, conref, conrefend, conaction, conkeyref) A set of related attributes, described in id-atts attribute group      
status The modification status of the current element. new | changed | deleted | unchanged | -dita-use-​conref-​target #IMPLIED No
translate 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. yes | no | -dita-use-​conref-​target #IMPLIED No
base 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. CDATA #IMPLIED No
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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