functions = {(None, 'boolean'): <function Boolean>, (None, 'ceiling'): <function Ceiling>, (None, 'concat'): <function Concat>, (None, 'contains'): <function Contains>, (None, 'count'): <function Count>, (None, 'false'): <function False>, (None, 'floor'): <function Floor>, (None, 'id'): <function Id>, (None, 'lang'): <function Lang>, (None, 'last'): <function Last>, ...}