code: public static boolean isOurFormatId(int formatIdentifier) {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "isOurFormatId", formatIdentifier);
  
          final boolean result;
  
          switch (formatIdentifier) { // Current format IDs
              case ZOS_FID_CB390:
              case ZOS_FID_CBLT:
              case WAS_FID_WASD:
                  result = true;
                  break;
  
              // Possible format IDs in the future
              case WAS_FID_WASC:
              case WAS_FID_WASZ:
              case ZOS_FID_WASZ:
              default:
                  result = false;
                  break;
          }
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "isOurFormatId", Boolean.valueOf(result));
  
          return result;
      }
docs: Checks to see if this formatId is one of our generated formatIds.
  This is a first pass check on recovery to filter XIDs from RMs.
  We do not need to validate platform as the next phase check is for
  UUID which will be different for each application server.
  
  @return true iff the format ID is 0xC9C20186 or 0xC9C2D3E3 and z/OS
  or 0x57415344 for distributed.