Representing Time

Knowledge Systems Laboratory, Stanford University

Class Hierarchy of Time Ontology

Calendar-January

. . .

Time-Point

Time-Interval

Convex-Time-Interval

Regular- Non-Convex -Time-Interval

Time-Interval-Left-Open

Time-Interval-Right-Open

Time-Interval-Right-Closed

Time-Interval-Left-Open-Right-Open

Time-Interval-Left-Closed-Right-Closed

Time-Interval-Left-Open-Right-Open

Time-Interval-Left-Closed-Right-Closed

Calendar-Month

Calendar-Day

Non-Convex-Time-Interval

Calendar-Sunday

Calendar-Saturday

Calendar-Day-1

Calendar-Day-31

Calendar-December

Time-Quantity

Time-Interval-Left-Closed