ExtFunctions = {('http://xmlns.4suite.org/ext', 'cos'): <function Cos>, ('http://xmlns.4suite.org/ext', 'degrees-to-rads'): <function DegreesToRads>, ('http://xmlns.4suite.org/ext', 'fact'): <function Fact>, ('http://xmlns.4suite.org/ext', 'sin'): <function Sin>}