Hierarchical Data

<?xml version="1.0" encoding="utf-8"?>
<students>
  <student id="0001">
    <name>Justin</name>
    <lastName>Example</lastName>
    <subjects>
      <subject>
        <name>Science</name>
      </subject>
      <subject>
        <name>Nature History</name>
      </subject>
      <subject>
        <name>Biology</name>
      </subject>
    </subjects>
  </student>
</students>

{
  "students": {
    "student": {
      "-id": "0001",
      "name": "Justin",
      "lastName": "Example",
      "subjects": {
        "subject": [
          { "name": "Science" },
          { "name": "Nature History" },
          { "name": "Biology" }
        ]
      }
    }
  }
}