EXPRESSION_EXTENSIONS_SCHEMA
short long

d	Assignment_target_select
e	Complex_type
e	Data_type
er	Defined_function
e	Entity_expression
e	Entity_instance
d	Entity_instance_select
er	Entity_instance_type
e	Environment
er	Expression
e	Expression_assignment
e	Expression_relationship
e	Generic_expression
er	Generic_literal
er	Generic_variable
e	Literal_assignment
e	Named_function
e	Named_variable
e	Simple_generic_expression
e	Variable_assignment
e	Variable_entity_type
e	Variable_semantics