XSL wont populate XHTML element attrs

Hello,

I know how to use
xsl:value-of to display content in XSL files.

However, I have ran into a problem using xsl:value-of to popluate the value of an XHMTL element attribute.

Such as:
<a href="<xsl:value-of select="foo" />">Click Me</a>

I get a nasty error when doing this.

How can I get this to work?

Thanks

Here is how I do my links

<xsl:template match="link">
<div>
<xsl:attribute name="class">
<xsl:value-of select="local-name()"/>
</xsl:attribute>
<a>
<xsl:attribute name="href">
<xsl:value-of select="url"/>
</xsl:attribute>
<xsl:attribute name="title">
<xsl:value-of select="abstract"/>
</xsl:attribute>
<xsl:value-of select="title"/> -
<xsl:value-of select="abstract"/>
</a>
</div>
</xsl:template>

example xml data
<link order="3">
<title>Legal stuff</title><abstract>Blah , blah, blah</abstract><url>legal.htm</url>
</link>
<link order="2">
<title>Privacy</title><abstract>Blah , blah, blah</abstract><url>privacy.htm</url>
</link>
<link order="10">
<title>Contact</title><abstract>Blah , blah, blah</abstract><url>contact.htm</url>
</link>

If you are setting several attributes for a tag, then you can also use <xsl:attribute-set> to group them, although its more typing.

Thanks, that helps so much.

Great reply.