A method and apparatus are set forth for creating a Document Object Model of an XML document of predetermined type, comprising a first process for receiving and opening a compressed input file containing the XML document; a second process for opening and parsing the contents of a relationships file to create a map of name-value pairs and detecting a value for identifying the predetermined type from among a plurality of types of XML documents; and a further process for parsing data in the XML document according to the predetermined type, and building the Document Object Model.