XML, SVG code, and scripting typically land in the laps of those who actually code the web page. Sometimes they can all be the same person—but in larger corporate or consulting groups, it is a split responsibility. And the one major point to remember is that when you hand off your design mockup files, you include everything!
All SVG source files, all output PNG files, every graphic you used to create the mockup, and more. And in fact, if you created object properties (names) for your layers and objects—give the programming team a cheat sheet of that information as well. All of this will make the transition from web design mockup to real web page easier, cleaner, and more efficient.