[Xsltforms-support] File Upload submit problem

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Hi,
I'm trying to use the new upload control, but can't get it to submit and I get submission-error from the xform.
I've pared it down to the simplest I can and it seems to be the schema that's tripping it up. Any ideas?

XForm looks like this - I've omitted declarations etc.
<head>
       <xf:model>
          <xf:instance xmlns=''>
                <data>
                    <xml-base64 xsi:type="xs:base64Binary"/>
                </data>
            </xf:instance>

           <xf:submission id='post-to-echo' 
                action='post-echo.xql' replace='all'
                method='post'/>
        </xf:model>
</head>
    <body>
         <xf:upload ref="xml-base64">
            <xf:label>Upload XML File:</xf:label>
        </xf:upload>
        <br/>
        <xf:output ref="xml-base64">
            <xf:label>XML file encoded in base64binary: </xf:label>
        </xf:output>
        <br/>
	<xf:submit submission="post-to-echo">
            <xf:label>Post to Echo</xf:label>
        </xf:submit>
</body>

And my XQuery (existdb)

xquery version "1.0";
declare namespace xsi="http://www.w3.org/2001/XMLSchema-instance";
declare namespace xmlns:xs="http://www.w3.org/2001/XMLSchema";

declare option exist:serialize "method=xml media-type=text/xml indent=yes";  

let $post-data := request:get-data()

   return
   <results>
   {util:binary-to-string($post-data/xml-base64)}
   </results>