Pdf 88 - Bnf

<numeric_object> ::= <integer> | <real> <integer> ::= <sign>? <digit>+ <digit> ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 <sign> ::= + | - <specific_value_example> ::= 88 // This is a terminal symbol