%isbn-elements;

ISBN Elements

Elements that can be included along with data characters inside the content model of the <isbn> 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 <isbn> element.

Content Model

<!ENTITY % isbn-elements 
                        " "                                          >

Module

common3.ent