RELEASE_2_1_13/src/blocks/forms/samples/forms/uploadprogress_model.xml

<?xml version="1.0"?>
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<fd:form xmlns:fd="http://apache.org/cocoon/forms/1.0#definition" xmlns:i18n="http://apache.org/cocoon/i18n/2.1">
  <fd:widgets>
  
    <fd:field id="user" required="true">
        <fd:datatype base="string"/>
        <fd:label>User name</fd:label>
    </fd:field>

    <fd:repeater id="uploads" initial-size="0">
        <fd:widgets>
            <fd:upload id="upload" mime-types="application/pdf" required="true">
                <fd:label>Upload some pdf files</fd:label>
                <fd:hint>You must choose pdf files</fd:hint>
            </fd:upload>
        </fd:widgets>
    </fd:repeater>
    
    <fd:repeater-action id="addupload" command="add-row" repeater="uploads">
        <fd:label>Add Upload</fd:label>
        <fd:hint>Add as many uploads as you need, before selecting files for them.</fd:hint>
    </fd:repeater-action>

    <fd:submit id="ok">
        <fd:label>Submit</fd:label>
        <fd:hint>Upload all files</fd:hint>
    </fd:submit>
    
  </fd:widgets>
</fd:form>