Bug 184762 BIRT Model - Enhancments to the level defintion
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/LevelViewHandle.java
{
		return new LevelViewTask( this ).getAggregationFunction( measureView );
	}
	/**
	 * Gets the measure view list that define aggregations for the given level
	 * view. Each item in the list is instance of <code>MeasureViewHandle</code>.
	 * 
	 * @param levelView
	 * @return
	 */
	public List getAggregationMeasures( )
	{
		return new LevelViewTask( this ).getAggregationMeasures( );
	}
	/**
	 * Gets the aggregation function for the level view sub-total. If the level
	 * view is null or not define any sub-total, return null.
	 * 
	 * @param measureView
	 * @param function
	 * @return
	 * @throws SemanticException
	 */
	public void setAggregationFunction( MeasureViewHandle measureView,
			String function ) throws SemanticException
	{
		new LevelViewTask( this ).setAggregationFunction( measureView, function );
	}
}