Extract values from an XML file, edit and save in another XML file.

Hi there. I’ve been a Knime user for some time, but this is the first time I’ve had to deal with XML files. I need to extract the information that is in the nodes of an XML file, multiply these values by four different factors (creating a table with 4 different columns with the same number of lines that were extracted from the XML) and save these values in another XML file already prepared to receive the manipulated values. So far I’ve only managed to import the XML and I’ve stopped at the XPath node. Could someone please help?