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%back-model; Back Matter Model

Content model for the back matter (<back>) of the document, for example, ancillary material such as appendices.
Declaration
<!ENTITY % back-model   "(label?, title*,
                          (%back-only.class; |
                           %both-front-back.class; |
                           %front-back.class; | %sec.class; |
                           %sig-block.class;)+  )"                   >
Expanded Declaration

(label?, title*, (app | app-group | floats-group | index | index-group | ref-list | ack | bio | dedication | fn-group | glossary | toc | toc-group | notes | sec | sig-block)+ )