Attributes?

How do I test for the presence of an attribute?  I have a tag:

<GROUP name="Bob">Some verbage here</GROUP>

I'm trying this command:

<xsl:template match="GROUP">
  <xsl:if test="@name">
    Do some stuff.
  </xsl:if>
</xsl:template>

It never reaches the 'Do some stuff' line even though GROUP possesses a 'Bob'
attribute, why?