Model

<!ENTITY % app-group-model
                        "(label?, title?, 
                          (%abstract.class;)*, (%kwd-group.class;)*,
                          (%subj-group.class;)*,
                          (%para-level;)*,
                          (%app.class; | %ref-list.class;)*)"        >

Expanded Model

(label?, title?, (abstract)*, (kwd-group)*, (subj-group)*, (address | alternatives | answer | answer-set | array | block-alternatives | boxed-text | chem-struct-wrap | code | explanation | fig | fig-group | graphic | media | 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 | disp-quote | speech | statement | verse-group)*, (app | ref-list)*)