doc pricing
fact quantity = [number]
fact is_member = [boolean]
fact base_price = 100
rule discount = 0%
unless quantity >= 10 then 10%
unless quantity >= 50 then 20%
unless is_member then 15%
rule price = base_price - discount?
doc employee_contract
fact salary = 5000 eur
fact start_date = 2024-01-15
fact vacation_days = 25
rule annual_salary = salary * 12
rule daily_rate = salary / 21
rule can_take_vacation = vacation_days? > 0