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<a class="logo" href='{umbraco.library:NiceUrl($currentPage/ancestor-or-self::Site//Subdomain/@id)}'>
  <xsl:variable name="mediaId" select="number($currentPage/ancestor-or-self::Site//logo)" />
  <xsl:if test="$mediaId > 0">
      <xsl:variable name="mediaNode" select="umbraco.library:GetMedia($mediaId, 0)" />
      <xsl:if test="$mediaNode/umbracoFile">
          <img src="{$mediaNode/umbracoFile}" alt="keba logo" />
      </xsl:if>
  </xsl:if>
</a>