I tried using something like
<dataSet showValues= '0'>
<set x='30' y='1.3' z='116' name='Traders' tooText= 'myCustomText1'/>
<set x='32' y='3.5' z='99' name='Farmers' tooText= 'myCustomText2'/>
<set x='8' y='2.1' z='33' name='Individuals' tooText= 'myCustomText3'/>
</dataSet>
Doesn't work for me can you provide examlpe json/xml for that.