XML is an open standard and is a text based markup language. The XML standard is maintained by the World Wide Web Consortium w3c.org.
XML Support in Dynamics AX
There are two abilities to read XML:
Both support parsing of XML Documents. The XMLDocument builds up the complete DOM tree. This is consumes more memory but allows you to access the document by the DOM methods. A SAX Parser is an event driven parser. It reads the document from an input stream and raises events on document start/end, element start/end, errors etc. It is up to you to handle these events.