BITS 0.2
( article-id*, article-categories?, title-group?, ( contrib-group | aff | aff-alternatives
)*, author-notes?, pub-date*, volume?, volume-id*, volume-series?, issue?, issue-id*,
issue-title*, issue-sponsor*, issue-part?, isbn*, supplement?, ( ( fpage, lpage?,
page-range? ) | elocation-id )?, ( email | ext-link | uri | product | supplementary-material
)*, history?, permissions?, self-uri*, ( related-article | related-object )*, abstract*,
trans-abstract*, kwd-group*, funding-group*, conference*, counts?, custom-meta-group?
)
BITS 1.0
( article-id*, article-categories?, title-group?, ( contrib-group | aff | aff-alternatives
)*, author-notes?, pub-date*, volume?, volume-id*, volume-series?, issue?, issue-id*,
issue-title*, issue-sponsor*, issue-part?, isbn*, supplement?, ( ( fpage, lpage?,
page-range? ) | elocation-id )?, ( email | ext-link | uri | product | supplementary-material
)*, history?, permissions?, self-uri*, ( related-article | related-object )*, ( abstract
)*, trans-abstract*, ( kwd-group )*, funding-group*, conference*, counts?, custom-meta-group?
)
BITS 2.0
( article-id*, article-categories?, title-group?, ( contrib-group | aff | aff-alternatives
)*, author-notes?, pub-date*, volume*, volume-id*, volume-series?, issue*, issue-id*,
issue-title*, issue-sponsor*, issue-part?, volume-issue-group*, isbn*, supplement?,
( ( fpage, lpage?, page-range? ) | elocation-id )?, ( email | ext-link | uri | product
| supplementary-material )*, history?, permissions?, self-uri*, ( related-article
| related-object )*, ( abstract )*, trans-abstract*, ( kwd-group )*, funding-group*,
conference*, counts?, custom-meta-group? )
BITS 2.1
( article-id*, ( article-version | article-version-alternatives )?, article-categories?,
title-group?, ( contrib-group | aff | aff-alternatives )*, author-notes?, ( ( pub-date
)* | pub-date-not-available? ), volume*, volume-id*, volume-series?, issue*, issue-id*,
issue-title*, issue-title-group*, issue-sponsor*, issue-part?, volume-issue-group*,
isbn*, supplement?, ( ( fpage, lpage?, page-range? ) | elocation-id )?, ( email |
ext-link | uri | product | supplementary-material )*, history?, pub-history?, permissions?,
self-uri*, ( related-article | related-object )*, ( abstract )*, trans-abstract*,
( kwd-group )*, funding-group*, support-group*, conference*, counts?, custom-meta-group?
)