结构化的：先有结构后有数据 {“a”:”b”} json xml(键值对存在) velue
非结构化的：html, str
Xml 格式的文件
<bookstore><book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</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></bookstore>
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