make grammar a class variable so it isnt' re-created every time (no state)
make grammar a class variable so it isnt' re-created every time (no state)

hsr-ba-fs15-dat/opendatahub,hsr-ba-fs15-dat/opendatahub,hsr-ba-fs15-dat/opendatahub,hsr-ba-fs15-dat/opendatahub,hsr-ba-fs15-dat/opendatahub