index() in bind error

>
> hello all
>    I have a proble with index(). when index() function in bind  
> element, it isn't work! for example:
> <xforms:instance>
>     <form xmln="">
>         <index/>
>         <items>
>             <item>item 1</item>
>             <item>item 2</item>
>         </items>
>     </form>
> </xforms:instance>
> <xforms:bind nodeset="index" calculate="../items/
> item[index('repeat')]"/>
> ...
> <xforms:input ref="index">
>     <xforms:action ev:event="xforms-value-changed">
>         <xforms:load resource="javascript:alert('xforms-value-
> changed')"/>
>     </xforms:action>
> </xforms:input>
> <xforms:repeat nodeset="items/item" id="repeat">
>     <xforms:input ref="."/>
> </xforms:repeat>
>
>
>
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