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
* 
	 * </ul>
	 * 
	 * @return the sort direction of this level view
	 */
	public String getSortDirection( )
	{
		return handle.getStringProperty( SORT_DIRECTION_PROP );
	}
	/**
	 * Returns the iterator for Sort list defined on this level. The element in
	 * the iterator is the corresponding <code>StructureHandle</code>.
	 * 
	 * @return the iterator for <code>SortKeyHandle</code> structure list
	 */
	public Iterator sortsIterator( )
	{
		PropertyHandle propHandle = handle.getPropertyHandle( SORT_PROP );
		if ( propHandle == null )
		{
			return Collections.EMPTY_LIST.iterator( );
		}
		return propHandle.iterator( );
	}
	/**
	 * Gets page break before property value of this level view.
	 * 
	 * @return page break before property value of this level view
	 */
	public String getPageBreakBefore( )