Binding validation & type to xbl component model elements

I am writing a control (simplified version shown below) that adds rows to a table for the user to enter data into. This data will eventually be used to draw a graph in the control (using Flot).

I cannot work out how to bind validations and types to the entries created in the model. I want to make entries in the first column of type xf:date so I get a date picker and I want to calculate the value for entry two. I also need to validate the five entries for not empty and some relationships (within a range, etc.).

So, how do I bind to the model entries? I've tried various bind statements like

<bind nodeset="date" type="xf:date" />

in various places but I cannot get it to work.

Thanks.

<xbl:xbl 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: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:fb="http://orbeon.org/oxf/xml/form-builder"
    xmlns:saxon="http://saxon.sf.net/" xmlns:im="http://www.infomedix.com.au/cpf/forms" xmlns:xbl="http://www.w3.org/ns/xbl"
    xmlns:xxbl="http://orbeon.org/oxf/xml/xbl">


    <fb:metadata>
        <fb:display-name lang="en">CPF Controls</fb:display-name>
    </fb:metadata>

    <xbl:binding id="im-growth-chart" element="im|growth-chart" xxbl:mode="lhha binding">
        <metadata xmlns="http://orbeon.org/oxf/xml/form-builder">
            <display-name lang="en">Growth Chart</display-name>
            <icon lang="en">
            </icon>
            <template>
                <im:growth-chart id="" ref="" xmlns="">
                    <xf:label ref="" />
                    <xf:hint ref="" />
                    <xf:help ref="" />
                    <xf:alert ref="$fr-resources/detail/labels/alert" />
                </im:growth-chart>
            </template>

        </metadata>
        <xbl:resources>
            <xbl:style src="/xbl/im/growth-chart/growth-chart.css" />
        </xbl:resources>
        <xbl:template>
            <!-- Internal model -->
            <xf:model id="local-model">   
                <!-- Growth chart info row prototype -->
                <xf:instance id="chart-row-prototype">
                    <row xmlns="">
                        <date />
                        <age />
                        <length />
                        <weight />
                        <headCircumference />
                    </row>
                </xf:instance>
            </xf:model>

            <xf:group id="im-component-group" model="local-model">

                <xf:var name="binding" value="xxf:binding('im-growth-chart')" />

                <div class="im-graph-data-table" xmlns="http://www.w3.org/1999/xhtml">
                    <table>
                        <tr>
                            <th style="width: 20%">Date</th>
                            <th style="width: 20%">Age (months)</th>
                            <th style="width: 20%">Length (cm)</th>
                            <th style="width: 20%">Weight (kg)</th>
                            <th style="width: 20%">Head Circumference (cm)</th>
                        </tr>
                        <xf:repeat nodeset="$binding/row">
                            <tr>
                                <td>
                                    <xf:input ref="date" />
                                </td>
                                <td>
                                    <xf:input ref="age" />
                                </td>
                                <td>
                                    <xf:input ref="length" />
                                </td>
                                <td>
                                    <xf:input ref="weight" />
                                </td>
                                <td>
                                    <xf:input ref="headCircumference" />
                                </td>
                            </tr>
                        </xf:repeat>
                    </table>
                    <xf:trigger>
                        <xf:label>Add</xf:label>
                        <xf:action ev:event="DOMActivate">
                            <xf:insert context="$binding" origin="xxf:instance('chart-row-prototype')" />
                        </xf:action>
                    </xf:trigger>
                </div>
            </xf:group>
        </xbl:template>
    </xbl:binding>
</xbl:xbl>

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Hi Alex,
  Thanks. That works, now I am able to update and validate my model. Onto the next problem! :-)

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