Publisher’s Location Elements
Elements that can be included along with data characters inside the content model of the <publisher-loc> element.
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 <publisher-loc> element.
<!ENTITY % publisher-loc-elements "| %address.class;" >
| addr-line | city | country | fax | institution | institution-wrap | phone | postal-code | state