來自本體的XML結構

Question

數據庫A包含每個城市及其體育場的足球俱樂部和板球俱樂部列表。我爲給定的本體寫了一個模糊的XML結構。但是結構中有錯誤。我無法找到XML中的錯誤。有人能指出這個錯誤嗎？

<?xml version='1.0'?> 
<City> 
<Name>London</Name> 

    <Football_clubs> 
     <club_details> 
      <name>Chelsea FC</name> 
      <stadium>Stamford Bridge</stadium> 
     </club_details> 
     <club_details> 
      <name>Fulham</name> 
      <stadium>Craven Cottage</stadium> 
     </club_details> 
     <club_details> 
      <name>Spurs</name> 
      <stadium>WHL</stadium> 
     </club_details> 
    </Football_clubs> 
    <Cricket_Clubs> 
     <club_details> 
      <name>Yorkshire</name> 
      <stadium>XYZ</stadium> 
     </club_details> 
     <club_details> 
      <name>Leicetshire</name> 
      <stadium>ABC</stadium> 
     </club_details> 
     <club_details> 
      <name>Surrey</name> 
      <stadium>GHI</stadium> 
     </club_details> 
    </Cricket_Clubs> 


</City> 


<City> 
<Name>Manchester</Name> 

    <Football_clubs> 
     <club_details> 
      <name>Manchester Utd</name> 
      <stadium>Old Trafford</stadium> 
     </club_details> 
     <club_details> 
      <name>Manchester City</name> 
      <stadium>Maine Road</stadium> 
     </club_details> 
     <club_details> 
      <name>Bolton</name> 
      <stadium>SDF</stadium> 
     </club_details> 
    </Football_clubs> 
    <Cricket_Clubs> 
     <club_details> 
      <name>Yorkshire</name> 
      <stadium>XYZ</stadium> 
     </club_details> 
     <club_details> 
      <name>Leicetshire</name> 
      <stadium>ABC</stadium> 
     </club_details> 
     <club_details> 
      <name>Surrey</name> 
      <stadium>GHI</stadium> 
     </club_details> 
    </Cricket_Clubs> 


    </City> 

Answer 1

絕對缺少根元素：

「每個XML文檔具有恰好一個單根元素此元件也被稱爲文檔元素，它包含所有的其它元素，因此是唯一的父。元素到所有其他元素。「 - 維基

應該是：

<?xml version='1.0'?> 
<cities> 
    <city> 
     ...contents 
    </city> 
    <city> 
     ...contents 
    </city> 
</cities>