Bug 201368 Support "Not In" operator in filter list
Description: After we support "IN" filter we should also support the "Not In" filter. Data part has already support the "Not In" filter, so hope model can support that operator in the filter operator list. Regards!
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/CssCommand.java
*/
	public CssCommand( Module module, DesignElement element )
	{
		super( module, element );
	}
	/**
	 * Adds new css file to report design.
	 * 
	 * @param fileName
	 *            css file name
	 * @throws SemanticException
	 *             if failed to add <code>CssStyleSheet</code> strcutre
	 */
	public void addCss( String fileName ) throws SemanticException
	{
		try
		{
			CssStyleSheet sheet = module.loadCss( fileName );
			addCss( sheet );
		}
		catch ( StyleSheetException e )
		{
			throw new CssException( module, new String[]{fileName},
					CssException.DESIGN_EXCEPTION_BADCSSFILE );
		}
	}
	/**
	 * Adds new css file to report design.
	 * 
	 * @param sheet