Rule 2: Subdivide Elements Into the Smallest Units of Information

• Combine with parent elements

• The Dumpty-Humpty principle: It is easier to put things together than take them apart

• Elements can contain other elements:

  <SONG>
    <TITLE>Hot Cop</TITLE>
    <COMPOSER>
      <GIVEN>Jacques</GIVEN> 
      <FAMILY>Morali</FAMILY>
    </COMPOSER>
    <COMPOSER>
      <GIVEN>Henri</GIVEN> 
      <FAMILY>Belolo</FAMILY>
    </COMPOSER>
    <COMPOSER>
      <GIVEN>Victor</GIVEN> 
      <FAMILY>Willis</FAMILY>
    </COMPOSER>
    <PRODUCER>
      <GIVEN>Jacques</GIVEN> 
      <FAMILY>Morali</FAMILY>
    </PRODUCER>
    <PUBLISHER>PolyGram Records</PUBLISHER>
    <LENGTH>6:20</LENGTH>
    <YEAR>1978</YEAR>
    <ARTIST>Village People</ARTIST>
  </SONG>
  

• Is the length unitary?