horse_race.xml

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE Event [
  <!ELEMENT   Event             (EventName, Race*)>
  <!ELEMENT   Race              (RaceNumber, RaceDistance, RaceComment?, Horse*)>
  <!ELEMENT   EventName         (#PCDATA)>
  <!ELEMENT   RaceNumber        (#PCDATA)>
  <!ELEMENT   RaceDistance      (#PCDATA)>
  <!ELEMENT   RaceComment       (#PCDATA)>
  <!ELEMENT   Horse             (HorseName, Teamster, HorseComment?)>
  <!ATTLIST   Horse             status (active | cancelled) "active">
  <!ELEMENT   HorseName         (#PCDATA)>
  <!ELEMENT   Teamster          (TeamsterName, TeamsterComment?)>
  <!ELEMENT   TeamsterName      (#PCDATA)>
  <!ELEMENT   TeamsterComment   (#PCDATA)>
  <!ELEMENT   HorseComment      (#PCDATA)>
]>

<Event>
  <EventName>United States Coast to Coast</EventName>
  <Race>
    <RaceNumber>48</RaceNumber>
    <RaceDistance>2000</RaceDistance>
    <RaceComment>The longest horse race in the world!</RaceComment>

    <Horse status="active">
      <HorseName>Lightning Bolt</HorseName>
      <Teamster>
        <TeamsterName>Rick González</TeamsterName>
      </Teamster>
    </Horse>

    <Horse>
      <HorseName>Rugged n' Ruff</HorseName>
      <Teamster>
        <TeamsterName>Billy Bob Johnson</TeamsterName>
        <TeamsterComment>Guaranteed to be drunk.</TeamsterComment>
      </Teamster>
      <HorseComment>This is one mean horse!</HorseComment>
    </Horse>
    
    <Horse status="cancelled">
      <HorseName>Ferdinand</HorseName>
      <Teamster>
        <TeamsterName>John "The Matador" Smith</TeamsterName>
      </Teamster>
      <HorseComment>Preferred to sit and smell the flowers.</HorseComment>
    </Horse>

  </Race>
</Event>