Simple XProc 3.0 pipeline for publishing letters

publish.xpl

<p:declare-step version="3.0" name="main"
                xmlns:c="http://www.w3.org/ns/xproc-step"
                xmlns:p="http://www.w3.org/ns/xproc"
                xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <p:output port="result" sequence="true"/>

  <p:variable name="targetDirectory" as="xs:string" select="resolve-uri('../../export/publish/', static-base-uri())"/>

  <p:file-delete href="{$targetDirectory}" recursive="true" fail-on-error="false"/>

  <p:directory-list path="../../daten/brief" max-depth="3"/>
  <p:xslt>
    <p:with-input port="stylesheet">
      <xsl:transform version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:mode on-no-match="shallow-copy"/>
        <xsl:template match="c:file">
          <xsl:copy>
            <xsl:sequence select="@*"/>
            <xsl:attribute name="path" select="string-join(ancestor-or-self::*/@name, '/')"/>
            <xsl:sequence select="node()"/>
          </xsl:copy>
        </xsl:template>
      </xsl:transform>
    </p:with-input>
  </p:xslt>
  <p:delete match="c:file[@name = 'transcript.xml']"/>

  <p:viewport match="c:file[@name = 'content.xml']" name="prepare-content">
    <p:group name="load-content">
      <p:output port="result"/>
      <p:load href="{resolve-uri(c:file/@name, base-uri(c:file))}"/>
      <p:xslt>
        <p:with-input port="stylesheet" href="publish-tei.xsl"/>
      </p:xslt>
    </p:group>
    <p:insert match="c:file" position="first-child">
      <p:with-input port="insertion" pipe="result@load-content"/>
      <p:with-input port="source" pipe="current@prepare-content"/>
    </p:insert>
  </p:viewport>

  <p:viewport match="c:file">
    <p:variable name="target" as="xs:string" select="resolve-uri(c:file/@path, $targetDirectory)"/>
    <p:choose>
      <p:when test="empty(c:file/*)">
        <p:file-copy href="{resolve-uri(c:file/@name, base-uri(c:file))}" target="{$target}"/>
      </p:when>
      <p:otherwise>
        <p:unwrap/>
        <p:store href="{$target}"/>
      </p:otherwise>
    </p:choose>
  </p:viewport>

  <p:sink/>

</p:declare-step>