Bug 208412 Enhance Chart Engine to process grouped, uni-dimensional Data
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationBase.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#setOutputFormat(java.lang.String)
	 */
	public void setOutputFormat( String sOutputFormat )
	{
		if ( sOutputFormat.equalsIgnoreCase( "HTML" ) ) 
		{
			if ( isOutputRendererSupported( outputFormat ) )
			{
				sExtension = outputFormat;
			}
			else if ( outputFormat != null
					&& outputFormat.toUpperCase( ).equals( "GIF" ) &&  
					isOutputRendererSupported( "PNG" ) ) 
			{
				
				sExtension = "PNG"; 
			}
			else if ( isOutputRendererSupported( "SVG" ) ) 
			{
				
				sExtension = "SVG"; 
			}
			else
			{
				sExtension = getFirstSupportedFormat( sSupportedFormats );
			}
		}
		else if ( sOutputFormat.equalsIgnoreCase( "PDF" ) )