Pipe 030 (AB)

The pipeline

<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" name="main" version="3.0">
   <p:input port="source">
      <doc1/>
   </p:input>
   <p:input port="secondary">
      <doc2/>
   </p:input>
   <p:output port="result"/>
   <p:choose>
      <p:when test="local-name(collection()[1]/*)='doc2' and local-name(collection()[2]/*)='doc1'" collection="true">
         <p:with-input pipe="secondary@main source@main"/>
         <p:identity>
            <p:with-input>
               <right/>
            </p:with-input>
         </p:identity>
      </p:when>
      <p:otherwise>
         <p:identity>
            <p:with-input>
               <wrong/>
            </p:with-input>
         </p:identity>
      </p:otherwise>
   </p:choose>
</p:declare-step>