Content model for the <sub-article> element.
The <floats-group> element used in this model is a container element to hold the floating objects (figures, tables, text boxes, graphics, etc.) that occur anywhere in the sub-article, where these floating objects are collected together rather than interspersed throughout the sub-article where they are referenced. This element was added to accommodate publishers who like to group all such floating objects together.
<!ENTITY % sub-article-model "( (front | front-stub), body?, back?, floats-group?, (sub-article* | response*) )" >