tests/test_tree/test_pretty.xml

<root>
  <heading>
    <inline>
      <text>
        Header
  <paragraph>
    <inline>
      <text>
        Here's some text and an image 
      <image src='image.png' alt=''>
        <text>
          title
  <ordered_list>
    <list_item>
      <paragraph>
        <inline>
          <text>
            a 
          <strong>
            <text>
              list
          <text>
  <blockquote>
    <paragraph>
      <inline>
        <text>
          a 
        <em>
          <text>
            quote