The RootDocImpl and DocEnv are some of the vestigial remains of the old doclet, and the names do not make sense any longer.

RootDocImpl now if the implementation of the DocletEnvironment, and shall be renamed to DocEnvImpl, to ensure we don't confuse it with DocEnv.

Now DocEnv, is really the bridge to the underlying javac among other support provided to the tool, and this will be renamed to ToolEnvironment.