xforms select trouble

[ClarkePeters]

I don't have any problems with select1 or textarea with my xforms in firefox 1.5.0.9, but I can't seem to get my "select" several choices to work.
I need to select zero or more of several choices. (more than one choice allowed to be checked)

here's my instance.xml:

<?xml version="1.0" ?>
<test>
<ii id="1">
 <qu id="0">
   <ans id="1" type="radio"></ans>
   <ans id="2" type="radio"></ans>
   <ans id="3" type="radio"></ans>
 </qu>
</ii>
</test>

Here's my xhtml/xforms file below. I first tried placing

ref="//ans[@id='1']    <!--and @id='2', '3' respectively-->

in each of the corresponding <value> elements. Then I tried placing just ...@id='1' in the <select> element just to see if I might get a string back. But I'm getting nothing. I tried wrapping each element separately into it's own select element but even that didn't work. Any ideas?

<?xml version="1.0" ?>
      <h:html
      xmlns:h="http://www.w3.org/1999/xhtml"
      xmlns:ev="http://www.w3.org/2001/xml-events"
      xmlns:xf="http://www.w3.org/2002/xforms">
 
<h:head>
 <h:title>XHTML/XForms</h:title>
 
<xf:model>
    <xf:instance src="xfinstance.xml"/>
     <xf:submission id="xfanswers"                
      action="http://localhost/PHPstuff/xfanswers.php"
       method="post"/>
 
 </xf:model>
</h:head>
 
<h:body>
 
<xf:label> Several answers may be correct </xf:label>
 
<xf:select  appearance="full">
    <xf:label> How well does Mary sing?  </xf:label>
 <xf:item>
   <xf:label> Well. </xf:label>
   <xf:value > Well. </xf:value>
 </xf:item>
 
<xf:item>
   <xf:label> well enough. </xf:label>
   <xf:value > well enough. </xf:value>
 </xf:item>
 
  <xf:item>
   <xf:label>better than most </xf:label>
   <xf:value> better than most </xf:value>
 </xf:item>
 
</xf:select>
<xf:submit submission="xfanswers">
   <xf:label>Submit</xf:label>
</xf:submit>
 
</h:body>
</h:html>