[Xsltforms-support] Integration of XSLTForms and XProc in eXist (temporary approach)

[Claudius T. <cla...@ya...>]

With kind help and patience of Alain Couthures, we have now an elegant manner to send instances from a XForms page generated using xproc to
another XForms page generated using xproc. This approach fills a gap and I guess is a temporary one, until XProc in eXist will use request object
(see other topics <a href="http://old.nabble.com/XProc%3A-%22No-request-object-found-in-the-current-XQuery-context.%22-when-using-%22request%3Aget-parameter-names%28%29%22-ts25921906.html#a26533936">here</a>).

For this, it is enough that one inserts the next JS script into the respective page:
    <script type="text/javascript">
        <![CDATA[ 
              XPathCoreFunctions["http://www.w3.org/2005/xpath-functions serialize"] = new XPathFunction(false, XPathFunction.DEFAULT_NONE, false, function(nodeSet) { return nodeSet.length === 0? "" : Writer.toString(nodeSet[0]); }); 
        ]]>
    </script>

And call the JS function like this:
<xf:setvalue ref="instance('standardParametersInstance')/serializedInstanceString" value="serialize(instance('connectionParametersInstance'))"/>

My suggestion is to have a dedicated instance for submission, as follows:
        <xf:instance id="submissionInstance">
            <bindings>
                <binding port="connectionParameters">
                    <test/>
                </binding>
            </bindings>
            </xf:instance>

And to fill and serialize this instance upon xforms-submit event of the respective submission. The serialized instance should be used within 
the resource element of the respective submission, as follows:
<xf:resource value="instance('standardParametersInstance')/serializedInstanceString"/>
                <xf:action ev:event="xforms-submit">
            <xf:setvalue ref="instance('standardParametersInstance')/serializedInstanceString" value="concat('nextXFormsPage.xproc?bindings=', serialize(instance('submissionInstance')))"/>
                </xf:action>


Claudius Teodorescu