Testing schematron validation: report should be child of c:error.
Test ab-validate-with-schematron-013.xml is expected to pass.
It requires the following features: p-validate-with-schematron.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" name="pipeline" version="3.0">
   <p:output port="result">
   <p:try>
      <p:validate-with-schematron report-format="xvrl">
         <p:with-input port="source" href="../documents/docbook-invalid.xml">
         <p:with-input port="schema" href="../documents/docbook.sch">
      </p:validate-with-schematron>
      <p:catch xmlns:err="http://www.w3.org/ns/xproc-error" code="err:XC0054">
         <p:count limit="1">
            <p:with-input xmlns:xvrl="http://www.xproc.org/ns/xvrl" select="//xvrl:report">
         </p:count>
      </p:catch>
   </p:try>
</p:declare-step>
<s:schema xmlns="http://www.w3.org/1999/xhtml" xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
   <s:ns prefix="c" uri="http://www.w3.org/ns/xproc-step">
   <s:pattern>
      <s:rule context="/">
         <s:assert test="c:result">Document element is not 'c:result'.</s:assert>
         <s:assert test="c:result/text() != '0'">Text child should not be '0'.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
Added explicit request for xvrl because svrl is default now.
Initial publication: Test ported from 1.0 test suite