usemap (of element-expression)? (is | isnt) (#none | #empty | usemap-name | usemap-name-list)
usemap is an element test, which tests the short reference map associated with the currently
opened element (or the element specified by element-expression) for one of the map names specified in the
This test is used to detect the association of
usemaps with the elements in the DTD, not in the
The test succeeds:
#emptyshort reference map is associated with the element and
Knowing whether or not an element type has an associated
usemap declaration is important if the
OmniMark program is creating an SGML document from an input SGML document:
usemap may affect the
way the short reference delimiters are interpreted. When "normalizing" a document, it is usually safest to issue
a "<!USEMAP #EMPTY>" declaration at the start of any element with which a
(for a map other than
#empty) has been associated in the DTD.
The usemap-name is the name of a
usemap declaration in the DTD.
Elements which have had short reference maps associated with them by
usemap declarations can be
identified by the
usemap is test. Short reference map names are subject to the
NAMECASE GENERAL declarations in the SGML
If element-expression specifies an element which does not exist, then the test fails.