p:xquery 030 (AB)

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error"
                xmlns:p="http://www.w3.org/ns/xproc"
                xmlns:t="http://xproc.org/ns/testsuite/3.0" version="3.0">
   <p:output port="result"/>
   <p:xquery version="1.0">
      <p:with-input port="source">
         <p:inline content-type="application/json">["one", "two"]</p:inline>
      </p:with-input>
      <p:with-input port="query">
         <p:inline content-type="text/plain">
                  declare namespace array="http://www.w3.org/2005/xpath-functions/array";
                  <result>{{array:get(., 2)}}</result>
               </p:inline>
      </p:with-input>
   </p:xquery>
</p:declare-step>