Problem with selecting nodes

Hello everyone!

I have problem that I don't know how to solve (as usually :-)

In my application user should choose attributes which he wants to be
displayed, e.g. key1 and key3
Than my XSL should select only element ccc with key="key1" or key="key3"
with highest priority.
In my example that should be

in element bbb i="1":
<ccc key="key3" priority="3">
	<color>FF0000</color>
</ccc>

in element bbb i="2":
<ccc key="key1" priority="1">
	<color>0000FF</color>
</ccc>

because user has chosen only key1 and key3

Here is my sample XML:

<?xml version="1.0" encoding="UTF-8"?>
<aaa>
	<bbb i="1">
		<ccc key="key1" priority="1">
			<color>0000FF</color>
		</ccc>
		<ccc key="key2" priority="2">
			<color>00FF00</color>
		</ccc>
		<ccc key="key3" priority="3">
			<color>FF0000</color>
		</ccc>
	</bbb>
	<bbb i="2">
		<ccc key="key1" priority="1">
			<color>0000FF</color>
		</ccc>
		<ccc key="key2" priority="2">
			<color>00FF00</color>
		</ccc>
	</bbb>
</aaa>


I have tried with this XSL:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:param name="key1"  select="1"/>
	<xsl:param name="key2"  select="0"/>
	<xsl:param name="key3"  select="1"/>

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

	<xsl:template match="bbb">
		<xsl:apply-templates select="ccc[($key1 and @key='key1') or ($key2 and
@key='key2')
			or ($key3 and @key='key3')]">
		</xsl:apply-templates>
	</xsl:template>

</xsl:template>

which select only elements bbb with atribut key which user has selected,
but doesn't select only element bbb with highest priority.
Result is:

in element bbb i="1":
<ccc key="key1" priority="1">
	<color>0000FF</color>
</ccc>

<ccc key="key3" priority="3">
	<color>FF0000</color>
</ccc>

in element bbb i="2":
<ccc key="key1" priority="1">
	<color>0000FF</color>
</ccc>


Any suggestions are apprecited.
Thanks in advance,
Denis Kranjcec


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