def _tag2pole_or_zero(element):
real = _tag2obj(element, _ns("Real"), float)
imag = _tag2obj(element, _ns("Imaginary"), float)
if real is not None or imag is not None:
real = real or 0
imag = imag or 0
x = ComplexWithUncertainties(real, imag)
real = _attr2obj(element.find(_ns("Real")), "minusError", float)
imag = _attr2obj(element.find(_ns("Imaginary")), "minusError", float)
if any([value is not None for value in (real, imag)]):
real = real or 0
imag = imag or 0
x.lower_uncertainty = complex(real, imag)
real = _attr2obj(element.find(_ns("Real")), "plusError", float)
imag = _attr2obj(element.find(_ns("Imaginary")), "plusError", float)
if any([value is not None for value in (real, imag)]):
real = real or 0
imag = imag or 0
x.upper_uncertainty = complex(real, imag)
x.number = _attr2obj(element, "number", int)
return x
