XSLT if sentence

I have this XSLT file:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/">
        <ul>
        <xsl:for-each select="opml/body/outline">
                <li id="{(_at_)url}"><a href="/{(_at_)url}"><xsl:value-of 
select="@title" /></a></li>
        </xsl:for-each>
        </ul>
</xsl:template>
</xsl:stylesheet>

I'd like an if sentence before the <ul> tag, so that only if there are
any outline rows, the <ul> tag will be there.

I hope you understand my poor english.

Thanks,
Jacob

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