namespace in XQuery

>  Dear All:
>  In the XQuery below, I declare a specific namespace but whenever I try to
> use it in the query itself, I get the following error from OPS: "No
> namespace defined for prefix ddi"
>  I'm using ops-3.0.beta3.200509020313 with eXist-snapshot-20051026. The
> query runs fine in the eXist sandbox, only difference in that the "for"
> statement does not need to be surrounded by {}. The query also runs under
> OPS if I use the *: instead of ddi: but then I can't specify a where clause
> and it I loose the namespace restriction. Any suggestion would be
> appreciated.
>  many thanks
>  Pascal
>
>      <p:processor name="oxf:xmldb-query">
>          <p:input name="datasource" href="datasource.xml"/>
>          <p:input name="query">
>              <xdb:query collection="/db/surveys">
>                  <xquery>
>                      xquery version "1.0";
>                      declare namespace
> ddi="http://www.icpsr.umich.edu/DDI";
>                      {for $s in /ddi:codeBook return
>                          <results>
>                              <title>{$s/ddi:stdyDscr//ddi:titl}</title>
>                          </results>
>                      }
>                  </xquery>
>              </xdb:query>
>          </p:input>
>          <p:output name="data" ref="data"/>
>      </p:processor>
>
>
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