Monotonic vs, non-monotonic rules Example: An online vendor wants to give a special discount if it is a customer's birthday Solution 1 R1: If birthday, then special discount But what happens if a customer refuses t R2: If not birthday, then not special discot provide his birthday due to privacy concerns? 9 Chapter 5 A Semantic Web primer9 Chapter 5 A Semantic Web Primer Monotonic vs. Non-monotonic Rules ⚫ Example: An online vendor wants to give a special discount if it is a customer’s birthday Solution 1 R1: If birthday, then special discount R2: If not birthday, then not special discount ⚫ But what happens if a customer refuses to provide his birthday due to privacy concerns?