code: private short getPageLength () {
          short pageLength = 0;
          for (int i = 0; i < identificationDescriptors.length; ++i) {
              pageLength += identificationDescriptors[i].size();
          }
          return pageLength;
      }
docs: Returns the combined length of all contained IDENTIFICATION DESCRIPTORs.
  
  @return the combined length of all contained IDENTIFICATION DESCRIPTORs