Package that contains classes that allow abstracting out the details of JDK platform version being used. Currently classes are used to implement "graceful degradation" of functionality, when certain JDK classes are only fully implemented as part of JDKs later than the minimum version Woodstox needs for running (for Woodstox versions up to 3.x it was JDK 1.2, for 4.x JDK 1.4).