nw-drp-002

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:ex="http://example.com/" xmlns:p="http://www.w3.org/ns/xproc" name="main" version="3.0">
   <p:output port="result" pipe="secondary"/>
   <p:declare-step type="ex:test" name="ptest">
      <p:input port="source" primary="true">
         <primary-input/>
      </p:input>
      <p:input port="alternate"/>
      <p:output port="result" primary="true" pipe="@primary-out"/>
      <p:output port="secondary" pipe="@secondary-out"/>
      <p:identity name="primary-out">
         <p:with-input pipe="source@ptest"/>
      </p:identity>
      <p:identity name="secondary-out">
         <p:with-input pipe="alternate@ptest"/>
      </p:identity>
   </p:declare-step>
   <p:identity>
      <p:with-input>
         <DRP/>
      </p:with-input>
   </p:identity>
   <ex:test/>
</p:declare-step>