A function used to filter which properties should be added to the bag, when filling it with e_cal_component_property_bag_new_from_component() and e_cal_component_property_bag_set_from_component().
an #ICalProperty
A function used to filter which properties should be added to the bag, when filling it with e_cal_component_property_bag_new_from_component() and e_cal_component_property_bag_set_from_component().