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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*,
                          (%doc-back-matter-mix;)* )"                >
Expanded Declaration

(label?, title*, (ack | app-group | bio | fn-group | glossary | ref-list | notes | sec)* )