XML文件中的游戏逻辑

<game>
 <level>
    <name>Level 1</name>
    <enemies>
      <enemy>
        <name>Goblin</name>
        <health>10</health>
        <attack>3</attack>
      </enemy>
      <enemy>
        <name>Orc</name>
        <health>20</health>
        <attack>5</attack>
      </enemy>
    </enemies>
  </level>
 <level>
    <name>Level 2</name>
    <enemies>
      <enemy>
        <name>Troll</name>
        <health>30</health>
        <attack>8</attack>
      </enemy>
      <enemy>
        <name>Dragon</name>
        <health>50</health>
        <attack>15</attack>
      </enemy>
    </enemies>
  </level>
</game>