DTD: Coding requirements for element domain modules
- Parameter entity name
 - 
               
               
The name of the parameter entity is the abbreviation for the domain, followed by a hyphen ("-"), and the name of the element that is extended.
 - Parameter entity value
 - 
               
               
The value of the parameter entity is a list of the specialized elements that can occur in the same locations as the extended element. Each element must be separated by the vertical line ( | ) symbol.
 
Example
Because the highlighting domain extends the
               <ph> element, the entity declaration file for that domain must
               include a parameter entity corresponding to the <ph> element. The
               name of the entity uses the short name of the domain (hi-d) followed by the
               name of the base element. The value includes each specialization of
               <ph> in the domain.
            
<!ENTITY % hi-d-ph "b | u | i | line-through | overline | tt | sup | sub">