Thanks William. The specific procedure is showing how to import a certain format of xml files to k2 form fields. This format is an imsld format (lesson description). Further details about this kind of xml files can be found in
www.imsglobal.org/learningdesign/ldv1p0/imsld_bestv1p0.html#... paragraph 3.2.5.1.3 Step 3: The XML Document Instance.
I havent try yet other formats of xml, but i think that once this can be done then any xml file can be imported to k2 form fields.