In this paper we explain how we implemented traceability between a UML design specification and its implementing source code using XML technologies. In our linking framework an XMI file represents a detailed- design specification and a JavaML file represents its source code. These XML-derivative representations were linked using another XML file, an Xlink link-base, containing our linking information. This link-base states which portions of the source code implement which portions of a design specification and vice-versa. We also rendered those links to an HTML file using XSL and traversed from our design specification to its implementing source code. This is the first step in our traceability endeavors where we aim to achieve total traceability among software life- cycle deliverables form requirements to source code.