BITS 0.2
( ( object-id )*, label?, ( caption )*, ( alt-text | long-desc | email | ext-link
| uri )*, ( disp-formula | disp-formula-group | chem-struct-wrap | disp-quote | speech
| statement | verse-group | table-wrap | p | def-list | list | alternatives | array
| graphic | media | preformat )*, ( attrib | permissions )* )
BITS 1.0
( ( object-id )*, label?, ( caption )*, ( abstract )*, ( kwd-group )*, ( alt-text
| long-desc | email | ext-link | uri )*, ( disp-formula | disp-formula-group | chem-struct-wrap
| disp-quote | speech | statement | verse-group | table-wrap | p | def-list | list
| alternatives | array | code | graphic | media | preformat )*, ( attrib | permissions
)* )
BITS 2.0
( ( object-id )*, label?, ( caption )*, ( contrib-group )*, ( abstract )*, ( kwd-group
)*, ( alt-text | long-desc | email | ext-link | uri )*, ( disp-formula | disp-formula-group
| chem-struct-wrap | disp-quote | speech | statement | verse-group | table-wrap |
p | def-list | list | alternatives | array | code | graphic | media | preformat )*,
( attrib | permissions )* )
BITS 2.1
( ( object-id )*, label?, ( caption )*, ( legend )*, ( contrib-group )*, ( abstract
)*, ( kwd-group )*, ( subj-group )*, ( alt-text | long-desc | email | ext-link | uri
)*, ( disp-formula | disp-formula-group | chem-struct-wrap | disp-quote | speech |
statement | verse-group | table-wrap | p | def-list | list | alternatives | array
| code | graphic | media | preformat | xref )*, ( attrib | permissions )* )