  <!ELEMENT YEAR (#PCDATA)>
  <!ELEMENT LEAGUE (LEAGUE_NAME, DIVISION, DIVISION, DIVISION)>
  
  <!-- American or National -->
  <!ELEMENT LEAGUE_NAME (#PCDATA)>

  <!-- East, West, or Central -->
  <!ELEMENT DIVISION_NAME (#PCDATA)>
  <!ELEMENT DIVISION (DIVISION_NAME, TEAM+)>
  <!ELEMENT SEASON (YEAR, LEAGUE, LEAGUE)>
  <!ENTITY % TEAM SYSTEM "team.dtd">
  %TEAM;
