Tests p:system-property().
Test ab-system-property-009.xml is expected to pass.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result">
   <p:identity>
      <p:with-input>
         <result>{p:system-property('p:i-am-not-known')}</result>
      </p:with-input>
   </p:identity>
</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="result">The document root is not result.</s:assert>
         <s:assert test="string-length(result/text())=0">Text node of result is not empty.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
Added tests for p:system-property