figuring out what grandparent(?) is

Simplified, part of my XML looks like this:

<article>
  <p>
    <link/>
  </p>
  <smallbox>
    <p>
      <link/>
    </p>
  </smallbox>
<article>

When processing the <link> template, I need to know whether I'm inside of
the <smallbox> or just in the <article>; that is, I need something like:

<xsl:choose>
  <xsl:when [descendant of smallbox]>
    do this
  </xsl:when>
  <xsl:otherwise>...

Explanations on the beginner level please!  Thanks much! Eric  : )



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