Wrong priority of mathematical operations

[st-vi]

The priority of the operations +, -, , / in feature attribute constraints is wrong. The expression ab + cd therefore gets interpreted as (a (b + c)) * d, which is wrong. Currently the grammar looks like this:
expression:
FLOAT # FloatLiteralExpression
| INTEGER # IntegerLiteralExpression
| STRING # StringLiteralExpression
| aggregateFunction # AggregateFunctionExpression
| reference # LiteralExpression
| OPEN_PAREN expression CLOSE_PAREN # BracketExpression
| expression ADD expression # AddExpression
| expression SUB expression # SubExpression
| expression MUL expression # MulExpression
| expression DIV expression # DivExpression
;

Changing it to the following solves the problem:
expression:
FLOAT # FloatLiteralExpression
| INTEGER # IntegerLiteralExpression
| STRING # StringLiteralExpression
| aggregateFunction # AggregateFunctionExpression
| reference # LiteralExpression
| OPEN_PAREN expression CLOSE_PAREN # BracketExpression
| expression DIV expression # DivExpression
| expression MUL expression # MulExpression
| expression ADD expression # AddExpression
| expression SUB expression # SubExpression
;