code: boolean isMarked()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
      {
        SibTr.entry(tc, "isMarked");
        SibTr.exit(tc, "isMarked", new Boolean(_marked));
      }
  
      return _marked;
    }
docs: Is Marked indicates if this object is still marked.
  If it is, then it can be removed.
  
  @return iMarked true if this Subscription is still marked.