Pz Help Simple XSL filter

hi all,
i try to write a simple filter using xsl. This is my test xml:

Code:

---

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <data name="aaa">
        <foo/>
    </data>
    <data name="xxx">
        <foo/>
    </data>
</root>

---

I desire to produce this:

Code:

---

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <data name="aaa">
        <foo/>
    </data>
</root>

---

whitout node with name=xxx, i try this xsl but don't work:

Code:

---

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:exsl="http://exslt.org/common"
                extension-element-prefixes="exsl">
    <xsl:output method="xml"/>

    <xsl:variable name="prima">
        <xsl:copy-of select="*"/>
    </xsl:variable>

    <xsl:variable name="seconda">
        <xsl:apply-templates mode="filtro"/>
    </xsl:variable>

    <xsl:template match="/">
        <xsl:copy-of select="$seconda"/>
    </xsl:template>


    <xsl:template match="data" mode="filtro">
        <xsl:if test="@name='aaa'">
            <xsl:copy-of select="$prima"/>
        </xsl:if>
    </xsl:template>
</xsl:stylesheet>

---

can someone help me plz?

ty to all