Thành viên:Trungvux

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 <book category="winxp">
   <title lang="en">windows xp</title>
   <author>trungvu</author>
   <year>2016</year>
   <price>30.00</price>
 </book>
 <book category="children">
   <title lang="en">Harry Potter</title>
   <author>J K. Rowling</author>
   <year>2005</year>
   <price>29.99</price>
 </book>
 <book category="web">
   <title lang="en">Learning XML</title>
   <author>Erik T. Ray</author>
   <year>2003</year>
   <price>39.95</price>
 </book>

</start>