Load initial form data

load-data.xhtml

<xhtml:html xmlns:xhtml="http://www.w3.org/1999/xhtml"
            xmlns:xforms="http://www.w3.org/2002/xforms"
            xmlns:xs="http://www.w3.org/2001/XMLSchema"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xmlns:ev="http://www.w3.org/2001/xml-events"
            xmlns:xi="http://www.w3.org/2001/XInclude"
            xmlns:xxi="http://orbeon.org/oxf/xml/xinclude"
            xmlns:xxforms="http://orbeon.org/oxf/xml/xforms"
            xmlns:exforms="http://www.exforms.org/exf/1-0"
            xmlns:fr="http://orbeon.org/oxf/xml/form-runner"
            xmlns:saxon="http://saxon.sf.net/"
            xmlns:sql="http://orbeon.org/oxf/xml/sql"
            xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <xhtml:head>
        <xhtml:title>Untitled Form</xhtml:title>
        <xforms:model id="fr-form-model">

            <!-- Main instance -->
            <xforms:instance id="fr-form-instance">
                <form>
                    <mySection>
                        <firstName/>
                        
                    </mySection>
                </form>
            </xforms:instance>

            <!-- User in which user data is collected -->
            <xforms:instance id="user-data">
                <registration>
                    <first-name>?</first-name>
                    <last-name/>
                </registration>
            </xforms:instance>

            <!-- Load initial data from a service -->
            <xforms:send ev:event="xforms-model-construct-done" submission="load-data-submission"/>
            <xforms:submission id="load-data-submission" method="get" serialization="none"
                               resource="http://localhost:7001/load-initial-form-data-pull-instance.xml"
                               replace="instance"
                               instance="user-data"/>

            <!-- force reloading of default values on ready -->
            <xforms:action ev:event="xforms-ready">
                <xforms:recalculate xxforms:defaults="true"/>
            </xforms:action>

            <!-- Bindings -->
            <xforms:bind id="fr-form-binds" nodeset="instance('fr-form-instance')">
                <xforms:bind id="mySection-bind" nodeset="mySection" name="mySection">
                    <xforms:bind id="firstName-bind" nodeset="firstName" name="firstName" type="xforms:string"
                                 xxforms:default="instance('user-data')/first-name"/>
                    
                </xforms:bind>
            </xforms:bind>

            <!-- Metadata -->
            <xforms:instance id="fr-form-metadata" xxforms:readonly="true">
                <metadata>
                    <application-name>helloworld</application-name>
                    <form-name>form</form-name>
                    <title xml:lang="en">Untitled Form</title>
                    <description xml:lang="en"/>
                    <author/>
                    <logo mediatype="" filename="" size=""/>
                </metadata>
            </xforms:instance>

            <!-- Attachments -->
            <xforms:instance id="fr-form-attachments">
                <attachments>
                    <css mediatype="text/css" filename="" size=""/>
                    <pdf mediatype="application/pdf" filename="" size=""/>
                </attachments>
            </xforms:instance>

            <!-- All form resources -->
            <!-- Don't make readonly by default in case a service modifies the resources -->
            <xforms:instance id="fr-form-resources" xxforms:readonly="false">
                <resources>
                    <resource xml:lang="en">
                        <mySection>
                            <label>Untitled Section</label>
                            <help/>
                        </mySection>
                        <firstName>
                            <label>First name</label>
                            <hint/>
                            <help/>
                            <alert/>
                        </firstName>
                        
                    </resource>
                </resources>
            </xforms:instance>

            <!-- Utility instances for services -->
            <xforms:instance id="fr-service-request-instance" xxforms:exclude-result-prefixes="#all">
                <request/>
            </xforms:instance>

            <xforms:instance id="fr-service-response-instance" xxforms:exclude-result-prefixes="#all">
                <response/>
            </xforms:instance>

        </xforms:model>
    </xhtml:head>
    <xhtml:body>
        <fr:view>
            <xforms:label ref="instance('fr-form-metadata')/title"/>
            <fr:body>
                <fr:section id="mySection-section" bind="mySection-bind">
                    <xforms:label ref="$form-resources/mySection/label"/>
                    <xforms:help ref="$form-resources/mySection/help"/>
                    <fr:grid columns="2">
                        <xhtml:tr>
                            <xhtml:td>
                                <xforms:input id="firstName-control" bind="firstName-bind">
                                    <xforms:label ref="$form-resources/firstName/label"/>
                                    <xforms:hint ref="$form-resources/firstName/hint"/>
                                    <xforms:help ref="$form-resources/firstName/help"/>
                                    <xforms:alert ref="$fr-resources/detail/labels/alert"/>
                                </xforms:input>
                            </xhtml:td>
                            <xhtml:td>
                                
                            </xhtml:td>
                        </xhtml:tr>
                    </fr:grid>
                </fr:section>
            </fr:body>
        </fr:view>
    </xhtml:body>
</xhtml:html>

Simpler example showing the use of <xforms:recalculate xxforms:defaults="true"/> to recalculate default values so that our submission data can be used as defaults.