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## Chapter 21. XML Document Sequencer

This sequencer stores the structure and data of an XML file into the repository. DTD, entity, comments, and other content are maintained by the sequencer in the output structure.

## 21.1. Example

For this XML document:

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

    <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [

    <!ENTITY % RH-ENTITIES SYSTEM "Common_Config/rh-entities.ent">

    <!ENTITY versionNumber "0.1">

    <!ENTITY copyrightYear "2008">

    <!ENTITY copyrightHolder "Red Hat Middleware, LLC.">]>

    <?target content ?>

    <?target2 other stuff ?>

    <Cars xmlns:jcr="http://www.jcp.org/jcr/1.0">

        <!-- This is a comment -->

        <Hybrid>

            <car jcr:name="Toyota Prius"/>

        </Hybrid>

        <Sports>

        </Sports>

    </Cars>

The sequencer will generate this content (listed in document view) if the sequencer `outputtingTo` property generates an output path ending in "myxml":

     xml jcr:primaryType=nt:unstructured

     <myxml jcr:primaryType="modexml:document"

            jcr:mixinTypes="mode:derived"

            mode:derivedAt="2011-05-13T13:12:03.925Z"

            mode:derivedFrom="/files/docForReferenceGuide.xml"

            modedtd:name="book"

            modedtd:publicId="-//OASIS//DTD DocBook XML V4.4//EN"

            modedtd:systemId="http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">

      <modedtd:entity jcr:primaryType="modedtd:entity"

                      modedtd:name="%RH-ENTITIES"

                      modedtd:systemId="Common_Config/rh-entities.ent" />

      <modedtd:entity[2] jcr:primaryType="modedtd:entity"

                         modedtd:name="versionNumber"

                         modedtd:value="0.1" />

      <modedtd:entity[3] jcr:primaryType="modedtd:entity"

                         modedtd:name="copyrightYear"

                         modedtd:value="2008" />

      <modedtd:entity[4] jcr:primaryType="modedtd:entity"

                         modedtd:name="copyrightHolder"

                         modedtd:value="Red Hat Middleware, LLC." />

      <modexml:processingInstruction jcr:primaryType="modexml:processingInstruction"

                                     modexml:processingInstructionContent="content"

                                     modexml:target="target" />

      <modexml:processingInstruction[2] jcr:primaryType="modexml:processingInstruction"

                                        modexml:processingInstructionContent="other stuff"

                                        modexml:target="target2" />

      <Cars jcr:primaryType="modexml:element">

        <modexml:comment jcr:primaryType="modexml:comment"

                         modexml:commentContent="This is a comment" />

        <Hybrid jcr:primaryType="modexml:element">

          <car jcr:primaryType="modexml:element" />

        </Hybrid>

        <Sports jcr:primaryType="modexml:element" />

      </Cars>

    </myxml>

The CND used by this sequencer is provided below. Note that the XML sequencer will parse CDATA into its own node in the sequenced output even though the example above does not explicitly demonstrate this.

    <modexml='http://www.modeshape.org/xml/1.0'>
    <modedtd='http://www.modeshape.org/dtd/1.0'>

    [modexml:document] > nt:unstructured, mix:mimeType
      - modexml:cDataContent (string)

    [modexml:comment] > nt:unstructured
      - modexml:commentContent (string)

    [modexml:element] > nt:unstructured

    [modexml:elementContent] > nt:unstructured
      - modexml:elementContent (string)

    [modexml:cData] > nt:unstructured
      - modexml:cDataContent (string)

    [modexml:processingInstruction] > nt:unstructured
      - modexml:processingInstruction (string)
      - modexml:target (string)

    [modedtd:entity] > nt:unstructured
      - modexml:name (string)
      - modexml:value (string)
      - modexml:publicId (string)
      - modexml:systemId (string)

    JcrConfiguration config = ...

    config.sequencer("XML Sequencer")

          .usingClass("org.modeshape.sequencer.xml.XmlSequencer")

          .loadedFromClasspath()

          .setDescription("Sequences XML documents and maps their data into the repository")

          .sequencingFrom("//(*.xml[*])/jcr:content[@jcr:data]")

          .andOutputtingTo("/xml/$1");

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