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
writer.attribute( "ss:StyleID", d.styleId );
		writer.closeTag( "Cell" );
	}
	public void endCell( )
	{
		writer.closeTag( "Cell" );
	}
	public void writeAlignment( String horizontal, String vertical )
	{
		writer.openTag( "Alignment" );
		writer.attribute( "ss:Horizontal", horizontal );
		writer.attribute( "ss:Vertical", vertical );
		writer.attribute( "ss:WrapText", "1" );
		writer.closeTag( "Alignment" );
	}
	public void writeBorder( String position, String lineStyle, String weight,
			String color )
	{
		writer.openTag( "Border" );
		writer.attribute( "ss:Position", position );
		if ( isValid( lineStyle ) )
		{
			writer.attribute( "ss:LineStyle", lineStyle );
		}
		if ( isValid( weight ) )
		{
			writer.attribute( "ss:Weight", weight );
		}
		if ( isValid( color ) )
		{