... you can also ...

  • supply additional (or replacement) declarations 
     <!ENTITY % seg IGNORE> 
<!ELEMENT %n.seg (#PCDATA)>
  • supply entirely new elements and embed them in the architecture 
    <!ENTITY % x.phrase 'blort|'>
<!ELEMENT blort (#PCDATA)>
<!ATTLIST blort %a.global;
          farble (foo|bar|baz) "baz">
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