code: @Override
      public SkinnyUUID getUUID(Parameter param) throws ResourceDownloadError,
              IndexingFailure, IOException {
          String srl = param.getNamespace().getResourceLocation();
          openEquivalence(srl);
          JDBMEquivalenceLookup lookup = openEquivalences.get(srl);
          return lookup.lookup(param.getValue());
      }
docs: {@inheritDoc}