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)@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.