/**
	  	     * Initialize the role of the collection.
	  	     *
	  	     * The CollectionEntry.reached stuff is just to detect any silly users who set up
	  	     * circular or shared references between/to collections.
	  	     */
	  	    void updateReachableCollection(PersistentCollection coll, Type type, Object owner) throws HibernateException {

	  	        CollectionEntry ce = getCollectionEntry(coll);

	  	        if (ce==null) {
	  	            // refer to comment in addCollection()
0x 	  	            throw new HibernateException("Found two representations of same collection: " + coll.getCollectionSnapshot().getRole());
	  	        }

	  	        if (ce.reached) {
	  	            // We've been here before
0x 	  	            throw new HibernateException("Found shared references to a collection: " + coll.getCollectionSnapshot().getRole());
	  	        }
  	        ce.reached = true;

	  	        CollectionPersister persister = getCollectionPersister( ( (PersistentCollectionType) type ).getRole() );
	  	        ce.currentPersister = persister;
	  	        ce.currentKey = getEntityIdentifier(owner); //TODO: better to pass the id in as an argument?

	  	        if ( log.isDebugEnabled() ) {
	  	            log.debug(
	  	                "Collection found: " + MessageHelper.infoString(persister, ce.currentKey) +
	  	                ", was: " + MessageHelper.infoString(ce.loadedPersister, ce.loadedKey)
	  	            );
	  	        }

      prepareCollectionForUpdate(coll, ce);

 }