code: private void printSpace(SemanticSpace sspace, String tag) {
          try {
              String EXT = ".sspace";
              File output = (overwrite)
                  ? new File(outputDir, sspace.getSpaceName() + tag + EXT)
                  : File.createTempFile(sspace.getSpaceName() + tag, EXT, 
                                        outputDir);
              
              long startTime = System.currentTimeMillis();
              SemanticSpaceIO.save(sspace, output, format);
              long endTime = System.currentTimeMillis();
              verbose("printed space in %.3f seconds%n",
                      ((endTime - startTime) / 1000d));
          } catch (IOException ioe) {
              throw new IOError(ioe);
          }
      }
docs: Prints the semantic space to file, inserting the tag into the .sspace
  file name