Bug 198594 XLS Emitter: Decimal value exported as String instead of Number
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelWriter.java
{
			if(hyperLink.getType( ) == IHyperlinkAction.ACTION_BOOKMARK) {
				
				writer.attribute( "ss:HRef", "#Sheet1!" + hyperLink.getUrl( ));
			}
			else{
			   writer.attribute( "ss:HRef", hyperLink.getUrl( ) );
			}
		}
		writer.attribute( "ss:MergeAcross", colspan );
		writer.attribute( "ss:MergeDown", rowspan );
	}
	
	public void writeDefaultCell(String content) {
		writer.openTag("Cell");
		writeText(content);
		writer.closeTag( "Cell" );
	}
	protected void writeTxtData( Data d )
	{
		startCell( d.span.getCol( ), d.span.getColSpan( ), 0, d.styleId, d.url );
		writeText( d.txt );
		endCell( );
	}
	protected void writeFormulaData( Data d )
	{
		writer.openTag( "Cell" );
		writer.attribute( "ss:Index", d.span.getCol( ) );
		writer.attribute( "ss:Formula", d.txt );
		writer.attribute( "ss:MergeAcross", d.span.getColSpan( ) );