constraints.txt

Constraints:

1. There are 3 kinds of Users : Pet Owner, Caretaker and PCS admin. 
2. Every Caretaker is either a Part-time or Full-time Caretaker. 
3. Every Caretaker earns Salary. 
4. Every Caretaker can care for a specific Pet any number of times. 
5. A Salary is based on Caretaker's base salary, Caretaker's rating, number of Pet-Days and Pet-Types taken care of.  
6. Every Pet belongs to a type of animal.
7. Every Pet is identified by their pet ID and Pet Owner's ID (UID).  
8. Every Pet Owner is identified by their UID.
9. Caretaker can take care of more than one Pet. 
10. Pet Owners can bid for Caretaker's services.
11. Every Pet is owned by 1 Pet Owner.
12. Every Pet Owner can own 1 or more Pets.
13. Both the Pet Owner and Caretaker should agree on how to transfer the Pet. 
14. Every Pet Owner can post a review for each Transaction.
15. Full-time caretaker cannot apply for leave if there is at least one Pet under their care.
16. For every job, where a Pet owned by the Pet Owner is taken care of by the Caretaker, there must be exactly one Transaction involved. 
17. Every Transaction corresponds to exactly one job.