Parameter Entities

• Internal
  <!ENTITY % name definition>
• External
  <!ENTITY % name SYSTEM URI>
<!ENTITY % name PUBLIC FPI URI>

Example:

   <!ELEMENT CUSTOMER (NAME, DATE, ORDERS)>
   <!ELEMENT BUYER (NAME, DATE, ORDERS)>
   <!ELEMENT DISCOUNTER (NAME, DATE, ORDERS)>

   <!ENTITY % record "(NAME, DATE, ORDERS)">
   <!ELEMENT CUSTOMER %record;>
   <!ELEMENT BUYER %record;>
   <!ELEMENT DISCOUNTER %record;>