There are certain rules that apply to element type specializations.
A specialized element type has the following characteristics:
@classattribute that specifies the specialization hierarchy of the element
DITA elements are never in a namespace. Only the
is in a DITA-defined namespace. All other attributes, except for those defined by the XML
standard, are in no namespace.
This limitation is imposed by the details of the
@class attribute syntax,
which makes it impractical to have namespace-qualified names for either vocabulary modules or
individual element types or attributes. Elements included as descendants of the DITA
<foreign> element type can be in any namespace.
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