Ignored markup. Either a start-tag or end-tag that is ignored because
it contains a document type specification that contains a name group
none of the names in which is the name of an active document type, or
a general or parameter entity reference that is ignored because it
contains a name group none of the names in which is the name of an
active document or link type, or a link set use declaration that is
ignored because its link type name is not an active link type,
or a general entity reference in an attribute value literal in
a start-tag that is itself ignored markup, or an entity declaration
that is ignored because the entity was already declared. |