add(left); add(right);
add(new DynamicCardinalityCheck(context, Cardinality.EXACTLY_ONE, left)); add(new DynamicCardinalityCheck(context, Cardinality.EXACTLY_ONE, right));
	public NodeComparison(StaticContext context, Expression left, Expression right, int relation) {		super(context);		this.relation = relation;		//add(new DynamicCardinalityCheck(context, Cardinality.EXACTLY_ONE, left));		//add(new DynamicCardinalityCheck(context, Cardinality.EXACTLY_ONE, right));		add(left);		add(right);	}