Adding xinclude to working pipeline

<?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"/> <!--http://docs-beta.rackspace.com/oxygen/13.1/mac/author/frameworks/rackbook/5.0/-->
  </p:input>

  <p:output port="result" primary="true">
    <p:pipe step="programlisting-keep-together-xslt" port="result"/>
  </p:output>
  <p:output port="report" sequence="true">
    <p:pipe step="tryvalidation" port="report"/>
  </p:output>
  <p:serialization port="report" indent="true"/>

  <!--
    Problem, the p:xinclude causes
    "Description: ERR : Unbound primary output: [output result on included]"
  -->
  <p:xinclude name="included">
    <p:input port="source">
      <p:pipe step="main"
        port="source"/>
    </p:input>
  </p:xinclude>

  <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"  assert-valid="true">
        <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:xslt name="id">
        <p:input port="source">
          <p:pipe step="catch" port="error"/>
        </p:input>
        <p:input port="stylesheet">
          <p:inline>
            <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">

              <xsl:param name="failonerror">yes</xsl:param>

              <xsl:template match="node()|@*">
                <xsl:message terminate="{$failonerror}">
                  <xsl:copy-of select="."/>
                </xsl:message>
                <xsl:copy>
                  <xsl:apply-templates select="node() | @*"/>
                </xsl:copy>
              </xsl:template>

            </xsl:stylesheet>
          </p:inline>
        </p:input>
        <p:input port="parameters" sequence="true">
          <p:empty/>
        </p:input>
      </p:xslt>
    </p:catch>
  </p:try>

  <p:xslt name="programlisting-keep-together-xslt">
    <p:input port="source">
      <p:pipe step="main" port="source"/>
    </p:input>
    <p:input port="stylesheet">
      <p:inline>
        <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
          xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:db="http://docbook.org/ns/docbook"
          exclude-result-prefixes="xs" version="2.0">

          <xsl:template match="node() | @*">
            <xsl:copy>
              <xsl:apply-templates select="node() | @*"/>
            </xsl:copy>
          </xsl:template>

          <xsl:param name="max">8</xsl:param>

          <xsl:template match="db:programlisting">
            <xsl:copy>
              <xsl:apply-templates select="@*"/>
              <xsl:if test="count(tokenize(.,'&#xA;')) &lt; $max">
                <xsl:processing-instruction name="dbfo">keep-together="always"</xsl:processing-instruction>
              </xsl:if>
              <xsl:apply-templates select="node()"/>
            </xsl:copy>
          </xsl:template>

        </xsl:stylesheet>
      </p:inline>
      <!--<p:document href="cloud/code-listing-keep-together.xsl"/>-->
    </p:input>
    <p:input port="parameters" sequence="true">
      <p:empty/>
    </p:input>
  </p:xslt>

</p:declare-step>