def __call__(self, value, property=None, client=None):
		if not value:
			raise BoundaryValueError(
				property, self, client, value,
				"""Value was "null" (evaluates as false)"""
			)
This function is the first derivative of the semilinear function (above).
dataset/ETHPy150Open correl/Transmission-XBMC/resources/lib/basictypes/boundary.py/NotNull.__call__--crossover with--dataset/ETHPy150Open pybrain/pybrain/pybrain/tools/functions.py/semilinearPrime