Code example for JoinedIterator

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			); 
	} 
	public Iterator getKeyClosureIterator() {
		return new JoinedIterator(
				getSuperclass().getKeyClosureIterator(),
				new SingletonIterator( getKey() )
			); 
	} 
	protected void addSubclassProperty(Property p) {
		super.addSubclassProperty(p);
		getSuperclass().addSubclassProperty(p);
	} 
	protected void addSubclassJoin(Join j) {
		super.addSubclassJoin(j);
		getSuperclass().addSubclassJoin(j);
	} 
 
	protected void addSubclassTable(Table table) {
		super.addSubclassTable(table);
		getSuperclass().addSubclassTable(table);
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