logger.exiting( AggregateExpression.class.getName( ),
this.groupLevel = -1; logger.exiting( AggregateExpression.class.getName( ),
	AggregateExpression( IAggregation aggregation )    {		logger.entering( AggregateExpression.class.getName( ),				"AggregateExpression" );    	this.aggregation = aggregation;    	this.arguments = new ArrayList();		logger.exiting( AggregateExpression.class.getName( ),				"AggregateExpression" );    }