Tests that output port with no @content-types accepts non-XML document.
Test ab-contenttypes-006.xml is expected to pass.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" xmlns:test="http://test" version="3.0">
   <p:output port="result">
   <p:declare-step type="test:step">
      <p:output port="result">
      <p:identity>
         <p:with-input>
            <p:inline content-type="text/plain">text</p:inline>
         </p:with-input>
      </p:identity>
   </p:declare-step>
   <test:step/>
   <p:wrap-sequence wrapper="result">
</p:declare-step>
<s:schema xmlns="http://www.w3.org/1999/xhtml" xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
   <s:ns uri="http://www.w3.org/ns/xproc" prefix="p">
   <s:ns uri="http://www.w3.org/ns/xproc-step" prefix="c">
   <s:pattern>
      <s:rule context="/">
         <s:assert test="result">Root element is not result.</s:assert>
         <s:assert test="/result/text()='text'">The root element does not have the right text child.</s:assert>
      </s:rule>
   </s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
Fixing broken test (namespace removed)
Corrected default of @content-types to be *.*
=Adapted tests to PR #422
Fix namespace declarations
Change test with document-properties to map{xs:QName, item()}
More tests.