xproc p:error

<?xml version="1.0" encoding="UTF-8"?>

<p:declare-step version="1.0"
  xmlns:p="http://www.w3.org/ns/xproc"
  name="main">

  <p:input port="source" /> <!--sequence="false" primary="true"-->
  <p:input port="schema" sequence="true" >
    <p:document  href="http://docs-beta.rackspace.com/oxygen/13.1/mac/author/frameworks/rackbook/5.0/rng/rackbook.rng"/>
  </p:input>

  <p:output port="result" primary="true">
    <p:pipe step="tryvalidation" port="result"/>
  </p:output>
  <p:output port="report" sequence="true">
    <p:pipe step="tryvalidation" port="report"/>
  </p:output>

  <p:try name="tryvalidation">
    <p:group>
      <p:output port="result">
        <p:pipe step="xmlvalidate" port="result"/>
      </p:output>
      <p:output port="report" sequence="true">
        <p:empty/>
      </p:output>

      <p:validate-with-relax-ng name="xmlvalidate">
        <p:input port="source">
          <p:pipe step="main" port="source"/>
        </p:input>
        <p:input port="schema">
          <p:pipe step="main" port="schema"/>
        </p:input>
      </p:validate-with-relax-ng>

    </p:group>
    <p:catch name="catch">
      <p:output port="result">
        <p:pipe step="main" port="source"/>
      </p:output>
      <p:output port="report">
        <p:pipe step="id" port="result"/>
      </p:output>
      <p:error name="relaxng-validation-error" code="rax:E001" xmlns:rax="http://docs.rackspace.com/api">
        <p:input port="source">
          <p:inline><message>This document is invalid. No docs for you!</message></p:inline>
        </p:input>
        <p:log port="result" />
      </p:error>
      <p:identity name="id">
        <p:input port="source">
          <p:pipe step="catch" port="error"/>
        </p:input>
      </p:identity>
    </p:catch>
  </p:try>

</p:declare-step>