<population_levels>
<!-- city -->
<level name="village" base="500" upgrade="1000" min="500" max="1000"/>
<level name="town" base="1000" upgrade="3000" min="1000" max="4000"/>
<level name="large_town" base="3000" upgrade="9000" min="3000" max="12000"/>
<level name="city" base="9000" upgrade="22000" min="9000" max="31000"/>
<level name="large_city" base="22000" upgrade="38000" min="22000" max="60000"/>
<level name="huge_city" base="38000" min="38000" max="100000"/>
<!-- castle -->
<level name="moot_and_bailey" base="500" upgrade="800" min="500" max="1300"/>
<level name="wooden_castle" base="800" upgrade="1500" min="800" max="2300"/>
<level name="castle" base="1500" upgrade="4500" min="1500" max="6000"/>
<level name="fortress" base="4500" upgrade="11000" min="4500" max="15500"/>
<level name="citadel" base="11000" upgrade="20000" min="11000" max="50000"/>
</population_levels>