%abstract-model; Abstract Model
Abstracts for books and book components may contain one or more paragraphs (as a typical journal abstract does) or titled sections, as is done in many physics journal articles. Unlike the default model in the base DTD Suite, this <abstract>; requires that all sections in the abstract start with titles.
<!ENTITY % abstract-model "((%id.class;)*, %sec-opt-title-model;)" >
((object-id)*, (sec-meta?, label?, title?, subtitle*, alt-title*, (address | alternatives | answer | answer-set | array | boxed-text | chem-struct-wrap | code | explanation | fig | fig-group | graphic | media | name-address-wrap | preformat | question | question-wrap | question-wrap-group | supplementary-material | table-wrap | table-wrap-group | disp-formula | disp-formula-group | def-list | list | tex-math | mml:math | p | related-article | related-object | ack | disp-quote | speech | statement | verse-group | x)*, (sec)*, (notes | fn-group | glossary | ref-list | sig-block)* ))