Simple service to post XForms and return the processed instance server-side

page-flow.xml

<controller xmlns="http://www.orbeon.com/oxf/controller">

    <service
        path="/validation/validate"
        view="validate.xpl"
        public-methods="POST"/>

    <epilogue url="oxf:/config/epilogue.xpl"/>

</controller>

validate.xpl

<p:config
    xmlns:p="http://www.orbeon.com/oxf/pipeline"
    xmlns:oxf="http://www.orbeon.com/oxf/processors"
    xmlns:xh="http://www.w3.org/1999/xhtml"
    xmlns:xf="http://www.w3.org/2002/xforms"
    xmlns:xxf="http://orbeon.org/oxf/xml/xforms"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>

    <p:param name="instance" type="input"/>
    <p:param name="data"     type="output"/>

    <p:processor name="oxf:xslt">
        <p:input name="data" href="#instance"/>
        <p:input name="config">
            <xsl:transform version="2.0">
                <xsl:import href="oxf:/oxf/xslt/utils/copy.xsl"/>

                <xsl:template match="xh:head">
                    <xsl:copy>
                        <xsl:apply-templates select="@* | node()"/>

                        <xf:model
                            id="fr-batch-validation-model"
                            xxf:xpath-analysis="true"
                            xxf:no-updates="true">

                            <xf:instance id="fr-result-instance" xxf:exclude-result-prefixes="#all">
                                <dummy/>
                            </xf:instance>

                            <xf:submission
                                id="fr-send-result"
                                ref="instance('fr-result-instance')"
                                method="post"
                                action="echo:"
                                replace="all"/>

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

                                <!-- Store first instance of first model -->
                                <xf:insert
                                    ref="instance('fr-result-instance')"
                                    origin="xxf:instance(xxf:list-instances(xxf:list-models()[1]))"/>

                                <!-- Output resulting instance -->
                                <xf:send submission="fr-send-result"/>

                            </xf:action>
                        </xf:model>
                    </xsl:copy>
                </xsl:template>

            </xsl:transform>
        </p:input>
        <p:output name="data" id="full-form"/>
    </p:processor>

    <p:processor name="oxf:xforms-to-xhtml">
        <p:input name="annotated-document" href="#full-form"/>
        <p:input name="instance"><dummy/></p:input>
        <p:input name="data"><dummy/></p:input>
        <p:output name="document" ref="data"/>
    </p:processor>

</p:config>