Store*
      propagate()
      {
         /// returns the next store available for scanning

         debug() << "propagate: " << url << endl;

         if( parent ) {
            parent->directory->append( directory );
            if( parent->stores.isEmpty() ) {
               return parent->propagate();
            }
            else
               return parent;
         }

         //we reached the root, let's get our next directory scanned
         return this;
      }