* Process documents in the input directories.
*/
private void processInputDirectories() {
String[] inputdirs = getOptionValues(SHORT_OPT_IN_PATH);
final List<File> files = new ArrayList<File>();
final XBELFileFilter xbelFileFilter = new XBELFileFilter();
final BELFileFilter belFileFilter = new BELFileFilter();
for (String inputdir : inputdirs) {
final File workingPath = new File(inputdir);
if (!workingPath.canRead()) {