<people>
  <person uid="????">
    <name>?????</name>
    <name>????</name>
  </person>
  <person phone="?????">
    <name>?????</name>
    <name>??????></name>
    <name>?????</name>
  </person>
</people>
Is the above XML Document not a well formed XML document because each person element contains more that one elements? Also is XSD XML Schema a set of recommendations for valid XML instance documents?