Tests p:choose with just a p:otherwise.
Test ab-choose-018.xml is expected to pass.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result">
   <p:choose>
      <p:otherwise>
         <p:identity>
            <p:with-input>
               <doc/>
            </p:with-input>
         </p:identity>
      </p:otherwise>
   </p:choose>
</p:declare-step>
<s:schema xmlns="http://www.w3.org/1999/xhtml" xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
   <s:pattern>
      <s:rule context="/">
         <s:assert test="/doc">Root element is not 'doc'.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
New tests