code: private State checkL(State state) throws DatatypeException, IOException {
          if (state.context.length() == 0) {
              state = appendToContext(state);
          }
          state.current = state.reader.read();
          state = appendToContext(state);
          state = skipSpaces(state);
          _checkL('L', true, state);
          return state;
      }
docs: Checks an 'L' command.