code: void mapOut(String out, Object comp, String comp_out) {
          if (comp == ca.getComponent()) {
              throw new ComponentException("cannot connect 'Out' with itself for " + out);
          }
          ComponentAccess ac_dest = lookup(comp);
          FieldAccess destAccess = (FieldAccess) ac_dest.output(comp_out);
          FieldAccess srcAccess = (FieldAccess) ca.output(out);
          checkFA(destAccess, comp, comp_out);
          checkFA(srcAccess, ca.getComponent(), out);
  
          FieldContent data = srcAccess.getData();
          data.tagLeaf();
          data.tagOut();
  
          destAccess.setData(data);
          dataSet.add(data);
  
          if (log.isLoggable(Level.CONFIG)) {
              log.log(Level.CONFIG, String.format("@Out(%s) -> @Out(%s)", srcAccess, destAccess));
          }
  //        ens.fireMapOut(srcAccess, destAccess);
      }
docs: Map two output fields.
  
  @param out the output field name of this component
  @param comp  the component
  @param comp_out  the component output name;