#3 file cannot load on Excel Mac 2004 / X / 2011

[Anonymous]

On Mac OS X the generated XML files cannot be opened by Excel. Excel comes up with an error message and generates a error log. That says (in german):
[code]XML-FEHLER in ExcelWorkbook-Beschreibung
GRUND: Ungültiger Wert
DATEI: Bildmengenauswertung.xml
GRUPPE: Row
TAG: Cell
ATTRIBUT: Index
WERT: 0[/code]

It means that in tag [code]cell[/code] the attribute [code]Index[/code] must not have the value [code]0[/code].

To get the generated files loaded I'am adding + 1 on the column variable which is used as the value in the [code]ss:Index[/code] attribute of the cell. (ExcelWriterXML_Sheet.php:333)