Hi Stéphane;
I did not do it but the City did.
The community of apps developers that have been a part of the Ottawa Open Data Hackfests (
http://www.opendataday.org/) were instrumental at encouraging the city to do this. They received their inspiration from other city and provincial initiatives such as in Edmonton and the BC App4ClimateChange contests, who were inspired by Contests in the US.
Hope this helps
Ciao
t
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Tracey P. Lauriault
613-234-2805