Tests primary result can be empty.
Test ab-xslt-090.xml is expected to pass.
It requires the following features: xslt-2.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result">
   <p:xslt version="2.0">
      <p:with-input>
         <doc/>
      </p:with-input>
      <p:with-input port="stylesheet">
         <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
            <xsl:template match="/">
               <xsl:result-document href="secondary">
                  <doc/>
               </xsl:result-document>
            </xsl:template>
         </xsl:stylesheet>
      </p:with-input>
   </p:xslt>
   <p:count/>
</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">The document root is not 'count'.</s:assert>
         <s:assert test="/c:result/text()='1'">The text in count is not '1'.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Corrected count to 1. There’s no equivalent of build-tree=false in 2.0.
Added attribute 'queryBinding' to schematron's schema.
Added tests for p:xslt with version="2.0".