<life>
  <bacteria division="domain">
    <bacterium>spirochetes</bacterium>
    <bacterium>proteobacteria</bacterium>
    <bacterium>cyanobacteria</bacterium>
  </bacteria>
  <archaea division="domain">
    <archaum></archaum>
  </archaea>
  <eukaryota division="domain">
    <eukaryotum>slime molds</eukaryotum>
    <eukaryotum>fungi</eukaryotum>
    <eukaryotum>plants</eukaryotum>
    <eukaryotum>animals</eukaryotum>
  </eukaryota>
</life>

