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Libxml declares a number of data types we
    will encounter repeatedly, hiding the messy stuff so you do not have to deal
    with it unless you have some specific need.
      
http://xmlsoft.org/html/libxml-tree.html#XMLCHARxmlChar A basic replacement for char, a byte in a UTF-8 encoded
	    string. If your data uses another encoding, it must be converted to
	      UTF-8 for use with 
libxml's	      functions. More information on encoding is available on the 
http://www.xmlsoft.org/encoding.htmllibxml encoding support web page .
	    
http://xmlsoft.org/html/libxml-tree.html#XMLDOCxmlDoc A structure containing the tree created by a parsed doc. http://xmlsoft.org/html/libxml-tree.html#XMLDOCPTRxmlDocPtr 	  is a pointer to the structure.
http://xmlsoft.org/html/libxml-tree.html#XMLNODEPTRxmlNodePtr 	    and 
http://xmlsoft.org/html/libxml-tree.html#XMLNODExmlNode A structure containing a single node. http://xmlsoft.org/html/libxml-tree.html#XMLNODEPTRxmlNodePtr 	  is a pointer to the structure, and is used in traversing the document tree.
    
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