| http://www.w3.org/ns/prov#value | - But, in my view, ???black swan??? should refer to something else: an event that is considered virtually impossible by those whose frame of reference is limited in time and geographical area, but not by those who consider other countries and other decades or centuries.The origin of the black swan metaphor was the belief that all swans are white, a conclusion that a nineteenth-century Englishman mig
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