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  <section refnum="1" xml:id="S1">
    <title>Grouping in multi-relations</title>
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    <paragraph xml:id="S1.SS0.SSS0.P1">
      <title>But period is somewhat different!</title>
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        <equation xml:id="S1.Ex6">
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    </paragraph>
  </section>
  <section refnum="2" xml:id="S2">
    <title>Arrows as meta-relation</title>
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  </section>
  <section refnum="3" xml:id="S3">
    <title>Other Meta relations</title>
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