void mapIn(String in, Object comp, String comp_in) {
		if (comp == ca.getComponent()) {
			throw new ComponentException("cannot connect 'In' with itself for "
					+ in);
		}
		ComponentAccess ac_dest = lookup(comp);
		FieldAccess destAccess = (FieldAccess) ac_dest.input(comp_in);
		checkFA(destAccess, comp, comp_in);
		FieldAccess srcAccess = (FieldAccess) ca.input(in);
		checkFA(srcAccess, ca.getComponent(), in);

		FieldContent data = srcAccess.getData();
		data.tagLeaf();
		data.tagIn();

		destAccess.setData(data);
		dataSet.add(data);
		if (log.isLoggable(Level.CONFIG)) {
			log.config(String.format("@In(%s) -> @In(%s)", srcAccess,
					destAccess));
		}
		// ens.fireMapIn(srcAccess, destAccess);
	}