BITS 0.2
( inline-supplementary-material | related-article | related-object | hr | string-date
| 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 | label | tex-math | mml:math | abbrev
| index-term | index-term-range-end | milestone-end | milestone-start | named-content
| styled-content | annotation | article-title | chapter-title | collab | collab-alternatives
| comment | conf-date | conf-loc | conf-name | conf-sponsor | date | date-in-citation
| day | edition | email | elocation-id | etal | ext-link | fpage | gov | institution
| isbn | issn | issn-l | issue | issue-id | issue-part | issue-title | lpage | month
| name | name-alternatives | object-id | page-range | part-title | patent | person-group
| pub-id | publisher-loc | publisher-name | role | season | series | size | source
| std | string-name | supplement | trans-source | trans-title | uri | volume | volume-id
| volume-series | year | fn | target | xref | sub | sup | x )+
BITS 1.0
( inline-supplementary-material | related-article | related-object | hr | string-date
| 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
| label | tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end
| milestone-start | named-content | styled-content | annotation | article-title |
chapter-title | collab | collab-alternatives | comment | conf-date | conf-loc | conf-name
| conf-sponsor | date | date-in-citation | day | edition | email | elocation-id |
etal | ext-link | fpage | gov | institution | institution-wrap | isbn | issn | issn-l
| issue | issue-id | issue-part | issue-title | lpage | month | name | name-alternatives
| object-id | page-range | part-title | patent | person-group | pub-id | publisher-loc
| publisher-name | role | season | series | size | source | std | string-name | supplement
| trans-source | trans-title | uri | volume | volume-id | volume-series | year | fn
| target | xref | sub | sup | x )+
BITS 2.0
( inline-supplementary-material | related-article | related-object | hr | string-date
| 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
| label | tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end
| milestone-start | named-content | styled-content | annotation | article-title |
chapter-title | collab | collab-alternatives | comment | conf-acronym | conf-date
| conf-loc | conf-name | conf-sponsor | data-title | date | date-in-citation | day
| edition | email | elocation-id | etal | ext-link | fpage | gov | institution | institution-wrap
| isbn | issn | issn-l | issue | issue-id | issue-part | issue-title | lpage | month
| name | name-alternatives | object-id | page-range | part-title | patent | person-group
| pub-id | publisher-loc | publisher-name | role | season | series | size | source
| std | string-name | supplement | trans-source | trans-title | uri | version | volume
| volume-id | volume-series | year | fn | target | xref | sub | sup | x )+
BITS 2.1
( inline-supplementary-material | related-article | related-object | hr | 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 | label
| tex-math | mml:math | abbrev | index-term | index-term-range-end | milestone-end
| milestone-start | named-content | styled-content | annotation | article-title |
chapter-title | collab | collab-alternatives | comment | conf-acronym | conf-date
| conf-loc | conf-name | conf-sponsor | data-title | date | date-in-citation | day
| edition | email | elocation-id | etal | ext-link | fpage | gov | institution | institution-wrap
| isbn | issn | issn-l | issue | issue-id | issue-part | issue-title | lpage | month
| name | name-alternatives | object-id | page-range | part-title | patent | person-group
| pub-id | publisher-loc | publisher-name | role | season | series | size | source
| std | string-date | string-name | supplement | trans-source | trans-title | uri
| version | volume | volume-id | volume-series | year | fn | target | xref | sub |
sup | x )+