'action-observer' is not triggered by the submission script

>
> the submission and append-attribute script both work independently,  
> yet the
> 'action-observer' is not triggered by the submission script on the
> 'xforms-submit-done' event. can someone please advise?
>
>  <xforms:submission
>    id="load-submission"
>    serialize="false"
>
> action="http://127.0.0.1:8080/exist/rest/db/gios/eml/ 
> {{xxforms:instance('parameters-instance')/eml-ver}}/
> {{xxforms:instance('parameters-instance')/document-id}}"
>    validate="false"
>    method="get"
>    replace="instance"
>    xxforms:instance="document-instance"
>    f:url-type="resource">
>
>  </xforms:submission>
>
>  <xforms:action ev:observer="load-submission"
> ev:event="xforms-submit-done">
>    <xup:modifications version="1.0">
>      <xup:append select="//*">
>        <xup:attribute name="show">y</xup:attribute>
>      </xup:append>
>    </xup:modifications>
>  </xforms:action>
>
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