BNFSymbol - BNF symbol
A BNF symbol is a variable in a BNF specification, which is defined by one or more BNF expressions. Symbols do have a neme and may consist of one or more expressions. Terminal symbols are tokens with a fixed value, which is stored in the name. Terminal symbols do not habe expressions.
Attributes
- name - Name for symbol
- terminate - Expressions defining the symbol
- is_keyword - Expressions defining the symbol
- expressions - BNF expressions referring to the symbol as first element
Functions

