a problem of mine....

hello everyone:
i'm a new guy to this heavenly place.

and now I have a problem with XSL, and wished to be helped.

the code is below: I'm so wondering with  XPath Language:  if  ....  can u give me a help??
xml:
<?xml version="1.0" encoding="GB2312"?>
<!DOCTYPE clone SYSTEM "simple.dtd">
<?xml:stylesheet type="text/xsl" href="simple.xsl"?>
<clone>
<rule>
<piece title="false" keyword="true">aaa</piece>
</rule>
<rule>
<piece title="false" keyword="true">bbb</piece>
</rule>
</clone>

XSL:

<?xsl version="1.0" encoding="GB2312"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl" xmlns="http://www.w3.org/TR/REC-html40" result-ns="">
<xsl:template><xsl:apply-templates/></xsl:template> 

<xsl:template match = "/">
<xsl:apply-templates select="clone"/>
</xsl:template>

<xsl:template match = "clone">
<xsl:for-each select="rule">
<xsl:for-each select="piece">
	<xsl:value-of/>
	<xsl:if test="{@title=true}">
	   <input type=checkbox checked>
	</xsl:if>
	<xsl:if test="{@keyword=true}">
	   <input type=checkbox checked>
	</xsl:if>
	</xsl:attribute>
</xsl:for-each>
<hr/>
</xsl:for-each>
</xsl:template> 
</xsl:stylesheet>

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list