Bug 152830 Need model's support to add jar files
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/StructureFactory.java
* @return an empty result set column structure
	 */
	public static ResultSetColumn createResultSetColumn( )
	{
		return new ResultSetColumn( );
	}
	/**
	 * Creates an empty search key structure.
	 * 
	 * @return an empty search key structure
	 */
	public static SearchKey createSearchKey( )
	{
		return new SearchKey( );
	}
	/**
	 * Creates an empty selection choice structure.
	 * 
	 * @return an empty selection choice structure
	 */
	public static SelectionChoice createSelectionChoice( )
	{
		return new SelectionChoice( );
	}
	/**
	 * Creates an empty sort key structure.
	 * 
	 * @return an empty sort key structure
	 */
	public static SortKey createSortKey( )