Image in stylesheet and new XPath mode

[pgundlach]

4.19.18

<data>
    <ul>
        <li>hello</li>
        <li>nice</li>
        <li>world</li>
    </ul>
</data>

and

<Layout xmlns="urn:speedata.de:2009/publisher/en"
    xmlns:sd="urn:speedata:2009/publisher/functions/en">
  <Stylesheet>
    ul {
      list-style-image: url('_samplea.pdf');
      padding: 9mm;
      }
  </Stylesheet>
    <Record element="data">
        <PlaceObject>
            <Textblock>
                <Paragraph>
                    <Value select="." />
                </Paragraph>
            </Textblock>
        </PlaceObject>
    </Record>
</Layout>

gives a fatal error.