Navision XmlPort

you have to write tags similar to html tags in notepad with .xml extension
corresponding to node name in xml port

From the Designers Guide(saving Compiling and Running an XML port):

Running an XMLport
XMLports are called from codeunits. While you are designing an XMLport, you will
often want to run it before it has been integrated into an application to check that it
functions as you intended. To do so, you can create a test-run codeunit that calls the
XMLport and either streams data to or from a file depending on whether you are
importing or exporting data.