[xsl] Problem with empty element check !

 Hi,

  I'm facing an issue with an empty element check using XSLT.Here's my
sample XSLT.I'm checking whether <money> has a value,id yes I'm
printing,else skip.But,even if there's no value or the tag doesn't
exist,the control is getting inside the xsl:if check and printing the
bullets.Any pointers will be appreciated. Here's the xsl I'm using.

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
	<xsl:template match="/">
		<html>
			<body>
				<h2>My CD Collection</h2>
				<table border="1">
					<tr bgcolor="#9acd32">
						<th>Title</th>
						<th>Artist</th>
					</tr>
					<xsl:for-each
select="catalog/cd">
						<xsl:variable
name="empty_string" select="money"/>
					        <xsl:if
test="not($empty_string = normalize-space(.))">
							<tr>
								<td>

<ul>

<li>

<xsl:value-of select="money"/>

</li>

</ul>
								</td>

<xsl:value-of select="name()"/>
							</tr>
						</xsl:if>
					</xsl:for-each>
				</table>
			</body>
		</html>
	</xsl:template>
</xsl:stylesheet>

Here's the sample XML:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="catalog.xsl"?>
<catalog>
  <cd>
     <title>Empire Burlesque</title>
     <artist>Bob Dylan</artist>
	 <price>
	 	<currency>Pound</currency>
	 </price>
  </cd>
  <cd>
     <title>Hide your heart</title>
     <artist>Bonnie Tyler</artist>
     <price>
	 	<currency>Pound</currency>
	 </price>
	 <money>22</money>
  </cd>
  <cd>
     <title>Greatest Hits</title>
     <artist>Dolly Parton</artist>
     <price>
	 	<currency>Pound</currency>
	 </price>
	 <money>33</money>
  </cd>
  <cd>
     <artist>John Denver</artist>
     <price>50</price>
	 <money></money>
  </cd>
</catalog>


Thanks

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