Orbeon 3.5 - Embedded eXist authentification

> Hi,
>
> I'm developping an application (orbeon 3.5) with the embedded eXist database and would like to authentificate the users by using eXists support for users. I've seen how you have done for the Blog example, but it doesn't work on my example.
>
> Here is my code:
>
> <p:param type="input" name="instance"/>
> <p:param type="output" name="re"/>
>
> <p:processor name="oxf:xslt">
>     <p:input name="data" href="#instance"/>
>     <p:input name="config">
>       <xdb:query collection="/db/"
>                xsl:version="2.0"
>                xmlns:xmldb="http://exist-db.org/xquery/xmldb">
>         xquery version "1.0";
>         <authenticated>
>             {xmldb:authenticate(concat('<xsl:value-of  
>                                   select="doc('../datasource.xml')/*/uri"/>',
>                                          '/db/examples/'),
>                                 '<xsl:value-of select="/form/username"/>',
>                                 '<xsl:value-of select="/form/password"/>')}
>          </authenticated>
>       </xdb:query>
>     </p:input>
>     <p:output name="data" id="xmldb-query"/>
> </p:processor>
>
> <p:processor name="oxf:xmldb-query">
>     <p:input name="datasource" href="../datasource.xml"/>
>     <p:input name="query" href="#xmldb-query"/>
>     <p:output name="data" ref="re"/>
> </p:processor>
>
>
> Can someone help me?
>
> Thanks.
>
>
>
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