%edition-elements;
Edition Elements
Elements that can be included along with data characters inside the content model of the <edition> element.
Remarks
This parameter entity is currently set as a null string, i.e., there is no string content. However, a customization module could redefine this parameter entity, thereby adding elements to the <edition> element.
Model
<!ENTITY % edition-elements
"| %subsup.class;" >Expanded Model
| sub | sup