1. A method for providing an XSLT mapping tool, the method comprising: receiving, by a computer system, XML source code that includes a plurality of source nodes; receiving, by the computer system, XSLT code configured to transform the XML source code into XML target code, wherein the XSLT code includes multiple XSLT templates; using, by the computer system, the multiple XSLT templates of the XSLT code and the XML source code to create the XML target code, wherein the XML target code includes a plurality of target nodes; modifying, by the computer system, the XSLT code to include a unique identifier assigned to each of the multiple XSLT templates; using, by the computer system, the modified XSLT code and the XML source code to create XML output code, the XML output code including the unique identifiers; using, by the computer system, the XML output code to determine mappings between the plurality of source nodes of the XML source code and the plurality of target nodes of the XML target code resulting from the multiple XSLT templates; and presenting, by the computer system, an interface of the XSLT mapping tool that displays the mappings between the plurality of source nodes of the XML source code and the plurality of target nodes of the XML target code resulting from the multiple XSLT templates.