docs: public PersistentTranId getPersistentTranId()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.entry(this, tc, "getPersistentTranId");
              SibTr.exit(this, tc, "getPersistentTranId", "return="+_ptid);
          }
          return _ptid;
      }