The universal attribute group defines a set of common attributes available on most DITA elements. The universal attribute group includes all attributes from the metadata, ID, localization, and debug attribute groups, plus the class attribute.
- class (Not for use by authors)
- This attribute is not for use by authors. If an editor displays class attribute values, do not edit them. The class attribute supports specialization. Its predefined values allow DITA tools to work correctly with ranges of related content. In a generalized DITA document the class attribute value in the generalized instance might differ from the default value for the class attribute for the element as given in the DTD or schema. See class attribute rules and syntax for more information. This attribute is specified on every element except for the dita container element. It is always specified with a default value, which varies for each element.