code: public static final String validPackaging()
      {
          return new StringBuilder()
              .append( MSBUILD_SOLUTION ).append( ", " )
              .append( EXE ).append( ", " )
              .append( DLL ).append( ", " )
              .append( LIB ).toString();
      }
docs: Return a string listing the valid packaging types
  @return a common separated list of packaging types