<populationsize>
 <size>
   <age>0</age>
   <sex>0</sex>
   <number>A</number>
 </size>
 <size>
   <age>0</age>
   <sex>1</sex>
   <number>B</number>
 </size>
 <size>
   <age>1</age>
   <sex>0</sex>
   <number>C</number>
 </size>
 <size>
   <age>1</age>
   <sex>1</sex>
   <number>D</number>
 </size>
</populationsize>
