BITS 0.2
( book-part-id*, subj-group*, title-group?, ( contrib-group | aff | aff-alternatives
| x )*, author-notes?, pub-date*, edition*, issn*, issn-l?, isbn*, publisher*, ( (
fpage, lpage? ) | elocation-id )?, supplementary-material*, pub-history*, permissions?,
self-uri*, ( related-article | related-object )*, abstract*, trans-abstract*, kwd-group*,
funding-group*, conference*, counts?, custom-meta-group*, ( notes )* )
BITS 1.0
( book-part-id*, subj-group*, title-group?, ( contrib-group | aff | aff-alternatives
| x )*, author-notes?, pub-date*, edition*, issn*, issn-l?, isbn*, publisher*, ( (
fpage, lpage? ) | elocation-id )?, supplementary-material*, pub-history*, permissions?,
self-uri*, ( related-article | related-object )*, ( abstract )*, trans-abstract*,
( kwd-group )*, funding-group*, conference*, counts?, custom-meta-group*, ( notes
)* )
BITS 2.0
NO CHANGE IN CONTENT MODEL
BITS 2.1
( book-part-id*, ( content-version | content-version-alternatives )?, subj-group*,
title-group?, ( contrib-group | aff | aff-alternatives | x )*, author-notes?, content-language*,
( ( pub-date )* | pub-date-not-available? ), edition*, issn*, issn-l?, isbn*, publisher*,
( ( fpage, lpage? ) | elocation-id )?, supplementary-material*, pub-history*, permissions?,
( self-uri )*, ( related-article | related-object )*, ( abstract )*, trans-abstract*,
( kwd-group )*, funding-group*, support-group*, conference*, counts?, custom-meta-group*,
( notes )* )