schedule.xml

<?xml version='1.0' encoding='utf-8' ?>
<schedule>
  <day>
    <room>
      <event id='1'>
        <date>2019-01-01T10:00:00+02:00</date>
        <duration>01:00</duration>
        <room>HALL 1</room>
        <title>Interesting talk in HALL 1 at 10:00</title>
        <persons>
          <person id='1'>Alice</person>
          <person id='2'>Bob</person>
          <person id='3'>Claire</person>
        </persons>
      </event>
      <event id='2'>
        <date>2019-01-01T10:00:00+02:00</date>
        <duration>01:00</duration>
        <room>HALL 2</room>
        <title>Interesting talk in HALL 2 at 10:00</title>
        <persons>
          <person id='4'>Dick</person>
        </persons>
      </event>
      <event id='3'>
        <date>2019-01-01T11:15:00+02:00</date>
        <duration>01:00</duration>
        <room>HALL 2</room>
        <title>Interesting talk in HALL 2 at 11:15</title>
        <persons>
          <person id='1'>Alice</person>
          <person id='4'>Dick</person>
        </persons>
      </event>
    </room>
  </day>
</schedule>