Collection of one or more Indexes. Collected Indexes need not be grouped into this element.
<!ELEMENT index-group %index-group-model; >
(title-group?, (address | alternatives | array | boxed-text | chem-struct-wrap | fig | fig-group | graphic | media | preformat | 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)*, (index)+)
The following, in order:
BITS-index0.ent