pipelineception-002

The pipeline

<p:declare-step xmlns:ex="http://example.com/ns" xmlns:p="http://www.w3.org/ns/xproc" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-inline-prefixes="#all" name="main" version="3.0">
   <p:output port="result" sequence="true"/>
   <p:declare-step type="ex:hash">
      <p:output port="result" content-types="text"/>
      <p:option name="text" as="xs:string" required="true"/>
      <p:option name="algorithm" as="xs:string" select="'sha'"/>
      <p:option name="version" as="xs:string?" select="if ($algorithm = 'sha') then '256' else ()"/>
      <p:hash algorithm="{$algorithm}" value="{$text}" match="/doc">
         <p:with-option name="version" select="$version"/>
         <p:with-input>
            <doc/>
         </p:with-input>
      </p:hash>
   </p:declare-step>
   <!----><ex:hash text="Hello, world." algorithm="sha"/>
  <p:wrap-sequence wrapper="hash"/>
--<p:identity>
      <p:with-input>
         <hash>{ex:hash(map{'text': 'Hello, world.'})?result}</hash>
      </p:with-input>
   </p:identity>
</p:declare-step>