%phrase; a single sequence of character data or single
%phrase.seq; sequence of character data and phrase-level data.
%component; a single chunk- or inter-level element
%component.seq; sequence of chunk- and inter-level elements; this is
the usual content of a
%paraContent; sequence of character data, phrase-level elements, and
inter-level elements; this is the usual contents of
chunks, including paragraphs.
%specialPara; specialized content model allowing either a sequence
of chunks or the same content as paraContent: used
for elements such as notes and list items, which
can behave either as chunk-level elements, or else
as containers for groups of component-level elements.
Individual constituent entities (e.g. %m.phrase) can also be used.