public OrExpression(int line, int column, ValueExpression left, ValueExpression right) : base(line, column, "or", left, right) { }
public AndExpression(int line, int column, ValueExpression left, ValueExpression right) : base(line, column, "and", left, right) { }
public NotExpression(int line, int column, ValueExpression parameter) : base(line, column, "not", parameter) { }