-<!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid.dtd">
-<platform version="3"><!-- For using with ping_pong, platform_sendrecv.xml -->
-
+<!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid/simgrid.dtd">
+<platform version="4">
+ <!-- For using with ping_pong, platform_sendrecv.xml -->