interpolating into xquery?

I want to parameterize an xquery I've borrowed from the
summary-query.xml in the gov't forms app.  The following doesn't work;
how can I get the desired result?


in the model of the xhtml view there is:

<xforms:action ev:event="xforms-ready">

    <xforms:insert nodeset="xxforms:instance('list-documents-query')"
        origin="doc('oxf:/apps/nexus/secure/summary-query.xml')"/>

    <xforms:send submission="list-documents-submission"/>

</xforms:action>


in summary-query is:

<exist:query xmlns:exist="http://exist.sourceforge.net/NS/exist">
    <exist:text>
        xquery version "1.0";
        declare namespace xmldb="http://exist-db.org/xquery/xmldb";
        &lt;documents>
            &lt;headers>
                &lt;header>Album&lt;/header>
                &lt;header>Artist&lt;/header>
            &lt;/headers>
            {
<!-- ** HERE ** -->
                let $collection-name :=
      '/db/collection/{xxforms:instance('some-instance')/username}/'

<SNIP!>
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Mike,

One way is to have an instance that you use to hold the query you send
to eXist. This is the instance posted to eXist:

<xforms:instance id="query">
    <exist:query>
        <exist:text/>
    </exist:query>
</xforms:instance>

Then you have an instance which contains the "template" of your query.
Note the <username/> which will then be replaced:

<xforms:instance id="get-albums">
    <query>
        your xquery...
        <username/>
        ...xquery continues
    </query>
</xforms:instance>

Before running the submission to eXist you do:

<xforms:setvalue ref="instance('get-albums')/username" value="..."/>
<xforms:setvalue ref="instance('query')/exist:text"
        value="instance('get-albums')"/>

Because value="instance('get-albums')" takes the string value of the
get-album instance, the <username> tags go away and you are just left
with its content of that element.

Alex

On 2/5/07, Mike Leary <[hidden email]> wrote:
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