code: public NewGTFSError setSequence(String sequenceAsString) {
          try {
              // Parse int from string value found during load stage.
              this.entitySequenceNumber = Integer.parseInt(sequenceAsString);
          } catch (NumberFormatException e) {
              e.printStackTrace();
              this.entitySequenceNumber = null;
          }
          return this;
      }
docs: reader)