src/test/resources/book-1.xml

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<book xmlns="http://maven.apache.org/BOOK/1.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/BOOK/1.0.0 ../../../target/generated-site/xsd/book-1.0.0.xsd">
  <id>plexus-user-guide</id>
  <title>Test Book</title>
  <chapters>
    <chapter>
      <id>chapter-1</id>
      <title>Chapter 1</title>
      <sections>
        <section>
          <id>section-1</id>
        </section>
        <section>
          <id>section-2</id>
        </section>
      </sections>
    </chapter>
    <chapter>
      <id>chapter-2</id>
      <title>Chapter 2</title>
      <sections>
        <section>
          <id>section-3</id>
        </section>
        <section>
          <id>section-4</id>
        </section>
      </sections>
    </chapter>
  </chapters>
</book>