hbar lays the bars down - the data XML, between the tags.
1The chart tag and its databars/languages.padpad
{chart'hbar',label='language',value='speakers',title='Speakers in millions',width=640,height=340}<languages><rowlanguage="English"speakers="1515"/><rowlanguage="Mandarin Chinese"speakers="1140"/><rowlanguage="Hindi"speakers="609"/><rowlanguage="Spanish"speakers="560"/><rowlanguage="Standard Arabic"speakers="332"/><rowlanguage="French"speakers="312"/><rowlanguage="Bengali"speakers="278"/><rowlanguage="Portuguese"speakers="264"/></languages>{/chart}