ISO13584_GENERIC_EXPRESSIONS_SCHEMA

f	Acyclic
e	Binary_generic_expression
e	Environment
e	Generic_expression
e	Generic_literal
e	Generic_variable
f	Is_acyclic
e	Multiple_arity_generic_expression
e	Simple_generic_expression
e	Unary_generic_expression
f	Used_variables
e	Variable_semantics