def startPrefixMapping(self, prefix, uri):
get_image returns image object from a collection based on a primary key (pk)
dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/python/Lib/xml/sax/handler.py/ContentHandler.startPrefixMapping--crossover with--dataset/ETHPy150Open NeuroVault/NeuroVault/neurovault/apps/statmaps/views.py/get_image