Parameter Entity References

• Only used in DTDs

• Use a % instead of an &:

  %inlines;
  %block;
  %mathml-prefix;
  %mathml-colon;
  

• Declared in a <!ENTITY %> declaration

  <!ENTITY % ERH "Elliotte Rusty Harold">   
  <!ENTITY COPY99 "Copyright 1999 %ERH;"> 
  <!ENTITY % inlines 
    "(PERSON | DEGREE | MODEL | PRODUCT | ANIMAL | INGREDIENT)*">
  <!ELEMENT PARAGRAPH %inlines;>
  <!ELEMENT CELL %inlines;>
  <!ELEMENT HEADING %inlines;>