81. <!ELEMENT trial (targets+, source,title+,message*,#PCDATA)>
The above example declares that the element trial must contain: [2.0]
a) exactly one 'target', at least
c) at least one 'target', exactly
one 'source', exactly one 'title',
one 'source', at least one
zero or one 'message', and
'title', zero or one
'message', and some other
some other parsed character
parsed character data.
data.
b) exactly one 'target', at least
not less than one 'message',
and some other parsed
character data.
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