XS 001 -7 (AB)

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" name="pipeline" version="3.0">
   <p:output port="result"/>
   <p:try>
      <p:identity>
         <p:with-input pipe="@last"/>
      </p:identity>
      <p:catch>
         <p:identity>
            <p:with-input>
               <failure/>
            </p:with-input>
         </p:identity>
      </p:catch>
   </p:try>
   <p:wrap-sequence wrapper="result" name="last"/>
</p:declare-step>