4
<person born="1912" died="1954">
6
<first_name>Alan</first_name>
7
<last_name>Turing</last_name>
9
<profession>computer scientist</profession>
10
<profession>mathematician</profession>
11
<profession>cryptographer</profession>
14
<person born="1918" died="1988">
16
<first_name>Richard</first_name>
17
<middle_initial>P</middle_initial>
18
<last_name>Feynman</last_name>
20
<profession>physicist</profession>
21
<hobby>Playing the bongoes</hobby>