<biography>
  <name><first_name>Alan</first_name> <last_name>Turing</last_name>
  </name> was one of the first people to truly deserve the name 
  <emphasize>computer scientist</emphasize>. Although his contributions 
  to the field are too numerous to list, his best-known are the 
  eponymous <emphasize>Turing Test</emphasize> and 
  <emphasize>Turing Machine</emphasize>. 

  <definition>The <term>Turing Test</term> is to this day the standard
  test for determining whether a computer is truly intelligent. This 
  test has yet to be passed. </definition>

  <definition>The <term>Turing Machine</term> is an abstract finite
  state automaton that can be proven equivalent to any other
  finite state automaton. Thus what is true for a Turing machine is
  true for all equivalent machines no matter how implemented.   
  </definition>

  <name><last_name>Turing</last_name></name> was also an accomplished   
  <profession>mathematician</profession> and
  <profession>cryptographer</profession>. His assistance 
  was crucial in helping the Allies decode the German Enigma
  machine. He committed suicide on <date><month>June</month> 
  <day>7</day>, <year>1954</year></date> after being 
  convicted of homosexuality and forced to take female 
  hormone injections.
</biography>
