master.xml

<data>
  <portfolio-collaborations>
    <section id="2" handle="collaborations">Collaborations</section>
    <entry id="454">
      <title handle="test-collaboration">Test collaboration</title>
      <images>
        <item>
          <file size="75 KB" path="/img/collaborations" type="image/jpeg">
            <filename>Agate-Necklace-by-The-Vamoose-001.jpg</filename>
         </file>
        </item>
        <item>
          <file size="87 KB" path="/img/collaborations" type="image/jpeg">
            <filename>Agate-Slice-Necklaces-by-The-Vamoose-001.jpg</filename>
          </file>
        </item>
        <item>
          <file size="226 KB" path="/img/collaborations" type="image/jpeg">
            <filename>A-Collection-by-The-Vamoose-001.jpg</filename>
          </file>
        </item>
        <item>
          <file size="125 KB" path="/img/collaborations" type="image/jpeg">
            <filename>Agate-Suede-and-Layered-Metal-Necklace-by-The-Vamoose-001.jpg</filename>
          </file>
        </item>
        <item>
          <file size="68 KB" path="/img/collaborations" type="image/jpeg">
            <filename>Acorn-Charm-and-Silk-Cord-Necklace-by-The-Vamoose-001.jpg</filename>
          </file>
        </item>
      </images>
      <position handle="10">10</position>
    </entry>
  </portfolio-collaborations>
  <portfolio-gallery>
    <section id="1" handle="images">Images</section>
    <entry id="456">
      <image size="226 KB" path="/img/gallery" type="image/jpeg">
        <filename>a-collection-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="465">
      <image size="141 KB" path="/img/gallery" type="image/jpeg">
        <filename>body-chain-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="466">
      <image size="65 KB" path="/img/gallery" type="image/jpeg">
        <filename>bracelets-by-the-vamoose-photography-by-eefje-de-coninck-001.jpg</filename>
      </image>
    </entry>
    <entry id="461">
      <image size="122 KB" path="/img/gallery" type="image/jpeg">
        <filename>amazonite-and-metal-necklace-by-the-vamoose-photography-by-eefje-de-coninck-001.jpg</filename>
      </image>
    </entry>
    <entry id="467">
      <image size="156 KB" path="/img/gallery" type="image/jpeg">
        <filename>braided-rope-and-metal-bead-necklace-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="464">
      <image size="86 KB" path="/img/gallery" type="image/jpeg">
        <filename>amethyst-necklaces-by-the-vamoose-001.jpg</filename>
     </image>
    </entry>
    <entry id="460">
      <image size="125 KB" path="/img/gallery" type="image/jpeg">
        <filename>agate-suede-and-layered-metal-necklace-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="470">
      <image size="105 KB" path="/img/gallery" type="image/jpeg">
        <filename>brass-and-gemstone-jewellery-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="468">
      <image size="60 KB" path="/img/gallery" type="image/jpeg">
        <filename>brass-and-gemstone-bracelet-by-the-vamoose-001.jpg</filename>
     </image>
    </entry>
    <entry id="459">
      <image size="87 KB" path="/img/gallery" type="image/jpeg">
        <filename>agate-slice-necklaces-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="457">
      <image size="68 KB" path="/img/gallery" type="image/jpeg">
        <filename>acorn-charm-and-silk-cord-necklace-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="458">
      <image size="75 KB" path="/img/gallery" type="image/jpeg">
        <filename>agate-necklace-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="455">
      <image size="226 KB" path="/img/gallery" type="image/jpeg">
        <filename>a-collection-inspiration-by-the-vamoose-001.jpg</filename>
       </image>
    </entry>
    <entry id="462">
      <image size="44 KB" path="/img/gallery" type="image/jpeg">
        <filename>amazonite-and-metal-necklace-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="469">
      <image size="155 KB" path="/img/gallery" type="image/jpeg">
        <filename>brass-and-gemstone-bracelets-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
    <entry id="463">
      <image size="78 KB" path="/img/gallery" type="image/jpeg">
        <filename>amethyst-and-leather-bracelet-by-the-vamoose-001.jpg</filename>
      </image>
    </entry>
  </portfolio-gallery>
</data>

master.xsl

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes" />

  <xsl:template match="data">
    <ul>
      <xsl:apply-templates select="portfolio-gallery/entry"/>
    </ul>
  </xsl:template>

  <xsl:template match="portfolio-gallery/entry">
    <xsl:param name="position"><xsl:number /></xsl:param>
      <li><img src="/image/gridsmall/img/gallery/{image/filename}" width="150" height="150"/></li>
    <xsl:apply-templates select="../../portfolio-collaborations/entry[position = $position]"/>
  </xsl:template>

  <xsl:template match="portfolio-collaborations/entry">
    <li class="big"><img src="/image/gridbig/img/collaborations/{images/item[1]/file/filename}" width="510" height="330"/></li>
  </xsl:template>

</xsl:stylesheet>