Is it possible to have more than one custom tab for the office ribbon?

Is it possible to have more than one custom tab for the office ribbon?

I can not find any documentation to verify this or any working examples
I want to achieve something like this xml below, but I think this really
is not possible.
<customUI onLoad="Ribbon_Load"
xmlns="http://schemas.microsoft.com/office/2010/01/customui">
<ribbon>
<tabs>
<tab idMso="TabAddIns" label="Ribbon1">
</tab>
<tab idMso="TabAddIns" label="Ribbon2">
</tab>
</tabs>
</ribbon>
</customUI>