Tests AVTs.
Test ab-avt-006.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>
         <doc a="3">text</doc>
      </p:with-input>
   </p:identity>
   <p:add-attribute match="/*" attribute-name="avt" attribute-value="{doc/text()}">
      <p:with-input>
         <doc/>
      </p:with-input>
   </p:add-attribute>
</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">The root element is not 'doc'.</s:assert>
         <s:assert test="doc/@avt='text'">AVT is not 'text'.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
New test