Well, its based on xml.
<?xml version="1.0" encoding="UTF-8"?>
<npc name="Soya" script="default.lua" walkinterval="5000">
<look type="136" head="149" body="78" legs="79" feet="132" addons="1" />
<parameters>
<parameter key="message_greet" value="Ah, a customer! Be greeted, |PLAYERNAME|!" />...