A Tree

<addressbook>
  <contact>
    <name>David Heitmeyer</name>
    <address>8 Story Street</address>
    <city>Cambridge</city>
    <state>Massachusetts</state>
    <zip>02138</zip>
    <phone type="office">617-999-5870</phone>
    <email>david_heitmeyer@harvard.edu</email>
  </contact>
  <contact>
    <name>Drew Gilpin Faust</name>
    <address>Massachusetts Hall</address>
    <city>Cambridge</city>
    <state>Massachusetts</state>
    <zip>02138</zip>
    <email>president@harvard.edu</email>
  </contact>
</addressbook>