def METHOD_NAME(self):
    etypes = self._get_types()
    element_property = zeros((self.n, 2), dtype='int32')
    n0 = 0
    for etype in etypes:
        n = etype.n
        element_property[n0:n0+n, 0] = etype.element_id
        element_property[n0:n0+n, 1] = etype.property_id
        n0 += n
    return element_property