get request attribute returning object and not string

> My xForm
>
> <xf:insert as="xs:string" ev:event="xforms-model-construct-done"
>               context="." origin="xxf:set-request-attribute('firstname',
> instance('user-data'))"/>
>
> Calling this from my servlet, and when i inspect the request parameter, it
> is coming as SAXStore object and not as String. Please tell me how to get
> the instance data as string.
>
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