Modifying the build.xml in 2.0
build.xml and common_build.xml
In Platform 2.0, the build.xml file has been completely redesigned. Instead of one file (per project), it is now two: build.xml, and common_build.xml. The former is only an override file for targets, and the latter contains the default targets. So common_build.xml is listed as an include in build.xml, meaning all of its contents are pulled into the build automatically. If you want to change a build target, do not edit common_build.xml directly. Instead, copy over the build target XML from common_build.xml into build.xml and change it accordingly.
This file contains build properties overrides.