Get all childs with xsl:for-each

Why can't I get all <a> or <img> tags inside a relation when I use the
above template?

<my-relation name="relatedImages" type="image" multi="yes">
              <td width="75%">
                <ul>
                  <li>
                  <a
href="../images/autobahnraser.jpg">autobahnraser.jpg</a>
                  <br />

                  </li>
                </ul>
              </td>
</my-relation>

In my template where I match all <my-????> tags I have:

				<xsl:when test="name(.) =
'my-relation'">
					<xsl:for-each
select="descendant-or-self::a">
						<foo url="{@url}"/>

					</xsl:for-each>
					<xsl:for-each
select="descendant-or-self::img">
						<bar src="{@src}"/>

					</xsl:for-each>
				</xsl:when>

And althoug there are <a> and <img> in my input XML I don't get any
<foo> and <bar> in the output. What am I doing wrong?

R.