Nested evaluate() expressions?

>
> Hi there,
>
> is it possible to next xxforms:evaluate() expressions? I need something like
> this in an attribute of some instance-data. This attribute is used then as
> follows to calculate the label which will be displayed.:
>
> <xforms:select1 ref="instance('tree-select')/select1"
> appearance="xxforms:tree" id="tree-id" incremental="true">
>                  <xforms:itemset nodeset="instance('treedata')/descendant::*">
>                          <xforms:label value="xxforms:evaluate(@Label)"/>
>                         <xforms:value value="@Value"/>
>                  </xforms:itemset>
>  </xforms:select1>
>
> In the attribute of the instance I need something like this:
>
> <SRN
> Label="concat(xxforms:evaluate(concat('instance(''main-instance2'')/Servicerufnummern/SRN[','3',']/Bezeichner')),xxforms:evaluate(concat('instance(''main-instance2'')/Servicerufnummern/SRN[','3',']/@ID')))"
> Value="">
> </SRN>
>
> As you can see I need to nest evaluates. I got the following error if I use
> this:
> [No error message provided.]
>
>
> Has someone an idea?
>
> Thanks
> Michael
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