Hello,

Consider the following XML:

<?xml version="1.0"?>

<root>

  <relevant>

    <element relevant-attribute="this attribute exists only on elements under relevant"/>

  </relevant>

  <irrelevant>

    <element/>

  </irrelevant>

</root>

And the following Schematron:

<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt3" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:map="http://www.w3.org/2005/xpath-functions/map">

  <ns prefix="map" uri="http://www.w3.org/2005/xpath-functions/map"/>

  <let name="some-map" value="map {}"/>

  <pattern>

    <rule context="/*/relevant/element[map:contains($some-map, @relevant-attribute)]">

      <assert test="true()">Impossible</assert>

    </rule>

  </pattern>

</schema>

When I validate the XML with the Schematron, Oxygen prints a warning that an empty sequence is not allowed as the second argument to map:contains, which I've determined is because it is testing the "element" elements under "irrelevant". I know this because if I add a second such element, the error prints twice. If I have 9, the error prints 9 times. But why is it testing that element? I deliberately used xpath that navigates via the parent because I want to include only elements under that parent, but it seems that it's looking at all elements, anywhere in the document, named 'element'. Is this expected?

I can silence the warning if I explicitly check for the presence of the attribute:

<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt3" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:map="http://www.w3.org/2005/xpath-functions/map">

  <ns prefix="map" uri="http://www.w3.org/2005/xpath-functions/map"/>

  <let name="some-map" value="map {}"/>

  <pattern>

    <rule context="/*/relevant/element[@relevant-attribute and map:contains($some-map, @relevant-attribute)]">

      <assert test="true()">Impossible</assert>

    </rule>

  </pattern>

</schema>

But not if I precede the broken rule with a rule that should equivalently prevent the broken rule from firing on those elements:

<?xml version="1.0" encoding="UTF-8"?>

<schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt3" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:map="http://www.w3.org/2005/xpath-functions/map">

  <ns prefix="map" uri="http://www.w3.org/2005/xpath-functions/map"/>

  <let name="some-map" value="map {}"/>

  <pattern>

    <rule context="/*/relevant/element[not(@relevant-attribute)]">

      <assert test="true()">Impossible</assert>

    </rule>

    <rule context="/*/relevant/element[map:contains($some-map, @relevant-attribute)]">

      <assert test="true()">Impossible</assert>

    </rule>

  </pattern>

</schema>

Thanks,

--

Danny MacMillan

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