Content model for an <disp-formula-group> element
<!ENTITY % disp-formula-group-model "(label?, (%caption.class;)?, (%access.class; | %address-link.class;)*, (%block-math.class;)* )" >
(label?, (caption)?, (alt-text | long-desc | email | ext-link | uri)*, (disp-formula | disp-formula-group)* )
JATS-math1.ent