<xsl:template match="entry">
    <a href="http://www.frob.org/search?type=simple&key={key}">
        <xsl:value-of select="description"/>
    </a>
</xsl:template>

If key includes embedded spaces you will have to use urlEncode.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
   xmlns:url="http://www.jclark.com/xt/java/java.net.URLEncoder">

<xsl:template match="entry">
    <a
href="http://www.frob.org/search?type=simple&key={url:encode(string(key))}">
        <xsl:value-of select="description"/>
    </a>
</xsl:template>


Jon Smirl
jonsmirl@xxxxxxxxxxxx



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