<!DOCTYPE memo [
  <!ELEMENT memo (to, from, subject, body)>
  <!ELEMENT to (#PCDATA)>
  <!ELEMENT from (#PCDATA)>
  <!ELEMENT subject (#PCDATA)>
  <!ELEMENT body (para+)>
  <!ELEMENT para (#PCDATA)>
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<memo>
  <to>Alice</to>
  <from>Bob</from>
  <subject>Meeting Tomorrow</subject>
  <body>
    <para>Please remember we have a team meeting scheduled for tomorrow at 10am.</para>
    <para>Agenda items include project status updates and planning for Q2.</para>
  </body>
</memo>
