XML_Unserializer - class to unserialize (read) XML documents
    Class to unserialize XML documents that have been created with  XML_Serializer.
    To unserialize an XML document you have to add  type hints to the XML_Serializer options.
   
    If no type hints are available, XML_Unserializer will guess how  the tags should be treated,
    that means complex structures will be arrays and tags with only CData in them will be strings.