Content model for the <contrib-group> element.
<!ENTITY % contrib-group-model "(%contrib.class; | %contrib-info.class; | %x.class;)+" >
(contrib | address | aff | aff-alternatives | author-comment | bio | email | etal | ext-link | fn | on-behalf-of | role | uri | xref | x)+
JATS-archivecustom-models1.ent