Norm Friesen Rory McGreal CanCore: Best Practices for Learning Object Metadata in Ubiquitous Computing Environments. 317-321 2005 conf/percom/2005w PerCom Workshops http://doi.ieeecomputersociety.org/10.1109/PERCOMW.2005.21 db/conf/percom/percomw2005.html#FriesenM05