1 <!ELEMENT document ANY>
   2 <!ELEMENT title (#PCDATA)>
   3 <!ELEMENT publisher_list (publisher*)>
   4 <!ELEMENT publisher (name, email?, homepage?, address?, voice?, fax?, dtdname?)>
   5 <!ELEMENT name (#PCDATA)>
   6 <!ELEMENT email (#PCDATA)>
   7 <!ELEMENT homepage (#PCDATA)>
   8 <!ELEMENT address (street+, city, state, zip, country?)>
   9 <!ELEMENT street (#PCDATA)>
  10 <!ELEMENT city (#PCDATA)>
  11 <!ELEMENT state (#PCDATA)>
  12 <!ELEMENT zip (#PCDATA)>
  13 <!ELEMENT country (#PCDATA)>
  14 <!ELEMENT voice (#PCDATA)>
  15 <!ELEMENT fax (#PCDATA)>
  16 <!ENTITY  familytree SYSTEM "familytree.dtd">