BITS 0.2
( #PCDATA | inline-supplementary-material | related-article | related-object | addr-line
| country | fax | institution | phone | hr | break | contrib-group | address | aff
| aff-alternatives | author-comment | bio | email | etal | ext-link | fn | on-behalf-of
| role | uri | xref | bold | italic | monospace | overline | overline-start | overline-end
| roman | sans-serif | sc | strike | underline | underline-start | underline-end |
alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math
| mml:math | abbrev | index-term | index-term-range-end | milestone-end | milestone-start
| named-content | styled-content | sub | sup | x )*
BITS 1.0
( #PCDATA | inline-supplementary-material | related-article | related-object | addr-line
| country | fax | institution | institution-wrap | phone | hr | break | contrib-group
| address | aff | aff-alternatives | author-comment | bio | email | etal | ext-link
| fn | on-behalf-of | role | uri | xref | bold | fixed-case | italic | monospace |
overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline
| underline-start | underline-end | ruby | alternatives | inline-graphic | private-char
| chem-struct | inline-formula | tex-math | mml:math | abbrev | index-term | index-term-range-end
| milestone-end | milestone-start | named-content | styled-content | sub | sup | x
)*
BITS 2.0
( #PCDATA | inline-supplementary-material | related-article | related-object | addr-line
| city | country | fax | institution | institution-wrap | phone | postal-code | state
| hr | break | contrib-group | address | aff | aff-alternatives | author-comment |
bio | email | etal | ext-link | fn | on-behalf-of | role | uri | xref | bold | fixed-case
| italic | monospace | overline | overline-start | overline-end | roman | sans-serif
| sc | serif | strike | underline | underline-start | underline-end | ruby | alternatives
| inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math
| abbrev | index-term | index-term-range-end | milestone-end | milestone-start | named-content
| styled-content | sub | sup | x )*
BITS 2.1
( #PCDATA | inline-supplementary-material | related-article | related-object | addr-line
| city | country | fax | institution | institution-wrap | phone | postal-code | state
| hr | break | contrib-group | address | aff | aff-alternatives | author-comment |
bio | email | etal | ext-link | fn | on-behalf-of | role | uri | xref | bold | fixed-case
| italic | monospace | overline | overline-start | overline-end | roman | sans-serif
| sc | serif | strike | underline | underline-start | underline-end | ruby | alternatives
| inline-graphic | inline-media | private-char | chem-struct | inline-formula | tex-math
| mml:math | abbrev | index-term | index-term-range-end | milestone-end | milestone-start
| named-content | styled-content | sub | sup | x )*