Form with calculated HTML value

form.xhtml

<xh:html xmlns:xh="http://www.w3.org/1999/xhtml" xmlns:xf="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:xxf="http://orbeon.org/oxf/xml/xforms"
         xmlns:exf="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/"
         xmlns:fb="http://orbeon.org/oxf/xml/form-builder">
    <xh:head>
        <xh:title>Untitled Form</xh:title>
        <xf:model id="fr-form-model" xxf:expose-xpath-types="true">

            <!-- Main instance -->
            <xf:instance id="fr-form-instance" xxf:exclude-result-prefixes="#all" xxf:index="id">
                <form>
                    <section-1>
                        <title/>
                        <show-details>true</show-details>
                        <first-name/>
                        <last-name/>
                        <result/>
                        
                    </section-1>
                </form>
            </xf:instance>

            <!-- Bindings -->
            <xf:bind id="fr-form-binds" ref="instance('fr-form-instance')">
                <xf:bind id="section-1-bind" name="section-1" ref="section-1">
                    <xf:bind id="title-bind" ref="title" name="title" relevant="$show-details = true()"/>
                    <xf:bind id="first-name-bind" ref="first-name" name="first-name" xxf:whitespace="trim"
                             relevant="$show-details = true()"/>
                    <xf:bind id="last-name-bind" ref="last-name" name="last-name" xxf:whitespace="trim"
                             relevant="$show-details = true()"/>
                    <xf:bind id="show-details-bind" ref="show-details" name="show-details" type="xf:boolean"/>
                    <xf:bind id="result-bind" ref="result" name="result" readonly="true()"
                             calculate="string-join(&#xA;  (&#xA;    '&lt;p&gt;&lt;i&gt;',&#xA;    xxf:itemset('title-control', 'xml', true())//item[@selected = 'true']/label,&#xA;    '&lt;/i&gt;',&#xA;    $first-name,&#xA;    $last-name,&#xA;    '&lt;/p&gt;'&#xA;  ),&#xA;  ' '&#xA;)"
                             relevant="$show-details = false()"/>
                    
                </xf:bind>
            </xf:bind>

            <!-- Metadata -->
            <xf:instance xxf:readonly="true" id="fr-form-metadata" xxf:exclude-result-prefixes="#all">
                <metadata>
                    <application-name>stackoverflow</application-name>
                    <form-name>html-output</form-name>
                    <title xml:lang="en">Untitled Form</title>
                    <description xml:lang="en"/>
                </metadata>
            </xf:instance>

            <!-- Attachments -->
            <xf:instance id="fr-form-attachments" xxf:exclude-result-prefixes="#all">
                <attachments>
                    <css mediatype="text/css" filename="" size=""/>
                    <pdf mediatype="application/pdf" filename="" size=""/>
                </attachments>
            </xf:instance>

            <!-- All form resources -->
            <xf:instance xxf:readonly="true" id="fr-form-resources" xxf:exclude-result-prefixes="#all">
                <resources>
                    <resource xml:lang="en">
                        <title>
                            <label>Title</label>
                            <hint/>
                            <item>
                                <label>Mr</label>
            
                                <value>mr</value>
                            </item>
                            <item>
                                <label>Mrs</label>
            
                                <value>mrs</value>
                            </item>
                            <item>
                                <label>Ms</label>
            
                                <value>ms</value>
                            </item>
                        </title>
                        <show-details>
                            <label>Show details</label>
                            <hint/>
                        </show-details>
                        <first-name>
                            <label>First name</label>
                            <hint/>
                        </first-name>
                        <last-name>
                            <label>Last name</label>
                            <hint/>
                        </last-name>
                        <result>
                            <label>Result</label>
                            <hint/>
                        </result>
                        <section-1>
                            <label>Untitled Section</label>
                        </section-1>
                        
                    </resource>
                </resources>
            </xf:instance>

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

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

        </xf:model>
    </xh:head>
    <xh:body>
        <fr:view>
            <fr:body xmlns:xbl="http://www.w3.org/ns/xbl" xmlns:p="http://www.orbeon.com/oxf/pipeline"
                     xmlns:oxf="http://www.orbeon.com/oxf/processors">
                <fr:section id="section-1-control" bind="section-1-bind">
                    <xf:label ref="$form-resources/section-1/label"/>
                    <fr:grid>
                        <xh:tr>
                            <xh:td>
                                <xf:select1 id="title-control" bind="title-bind" appearance="dropdown">
                                    <xf:label ref="$form-resources/title/label"/>
                                    <xf:hint ref="$form-resources/title/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                    <xf:itemset ref="$form-resources/title/item">
                                        <xf:label ref="label"/>
                                        <xf:value ref="value"/>
                                    </xf:itemset>
                                </xf:select1>
                                
                            </xh:td>
                            <xh:td>
                                <fr:yesno-input xmlns="http://orbeon.org/oxf/xml/form-builder"
                                                xmlns:xxbl="http://orbeon.org/oxf/xml/xbl"
                                                id="show-details-control"
                                                bind="show-details-bind">
                                    <xf:label ref="$form-resources/show-details/label"/>
                                    <xf:hint ref="$form-resources/show-details/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                </fr:yesno-input>
                            </xh:td>
                        </xh:tr>
                        <xh:tr>
                            <xh:td>
                                <xf:input id="first-name-control" bind="first-name-bind">
                                    <xf:label ref="$form-resources/first-name/label"/>
                                    <xf:hint ref="$form-resources/first-name/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                </xf:input>
                            </xh:td>
                            <xh:td/>
                        </xh:tr>
                        <xh:tr>
                            <xh:td>
                                <xf:input id="last-name-control" bind="last-name-bind">
                                    <xf:label ref="$form-resources/last-name/label"/>
                                    <xf:hint ref="$form-resources/last-name/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                </xf:input>
                            </xh:td>
                            <xh:td/>
                        </xh:tr>
                        <xh:tr>
                            <xh:td>
                                <fr:tinymce xmlns:xxbl="http://orbeon.org/oxf/xml/xbl"
                                            xmlns:f="http://orbeon.org/oxf/xml/formatting"
                                            id="result-control"
                                            bind="result-bind">
                                    <xf:label ref="$form-resources/result/label"/>
                                    <xf:hint ref="$form-resources/result/hint"/>
                                    <xf:alert ref="$fr-resources/detail/labels/alert"/>
                        
                        
                                </fr:tinymce>
                            </xh:td>
                            <xh:td/>
                        </xh:tr>
                    </fr:grid>
                </fr:section>
            </fr:body>
        </fr:view>
    </xh:body>
</xh:html>