selecting elements only if they all have a particular

 Hello all,

I have the following XML 

<property name="Hotel A" id="1">
<vacancy>
<month name="4">
<date date="1" day="Thursday">
<roomType id="1" count="1" type="1R" cost="100"/>
<roomType id="10" count="1"type="2DK" cost="100"/>
<roomType id="13" count="1" type="3DK" cost="100"/>
</date>
<date date="2" day="Friday">
<roomType id="1" count="0" type="1R" cost="100"/>
<roomType id="10" count="1" type="2DK" cost="100"/>
<roomType id="11" count="1" type="2DK" cost="200"/>
<roomType id="12" count="2" type="2LDK" cost="100"/>
</date>
</month>
</vacancy>
</property>

I want to display a radio button for each unique
roomType (determined by id) that has a "count" greater
than zero for both days. I am able to list the
roomTypes without duplication using the XSLT below,
but I can't get my head around how to only deal with
the roomTypes with count>0 for both days in the first
place. Can anyone help?
Cheers,Donal

<xsl:key name="roomTypeId" match="//date/roomType"
use="@id"/>
<xsl:template match="/property">
<table>
<tr><td><xsl:value-of select="@name"/></td></tr>
</table>
<table width="300" border="0" cellspacing="0"
cellpadding="2">
	<tr>
		<td width="22">&#160;</td>
		<td>roomType</td>
		<td>cost</td>
    </tr>
	
	<xsl:apply-templates
select="//date/roomType[count(.|key('roomTypeId',@id)[1])=1
and @count &gt; 0]"/>
</table>
</xsl:template>

<xsl:template match="roomType">
<tr>

	<td>	
		<input type="radio" name="roomType"
onClick="showCalendar(this.id)">
			<xsl:attribute name="id"><xsl:value-of
select="@id"/></xsl:attribute>
		</input>
	</td>
	<td><xsl:value-of select="@type"/></td>
	<td><xsl:value-of select="@cost"/></td>
</tr>
	

</xsl:template>




	
	
		
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