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3. Qualitative representation with Allen interval algebra
Interval algebra was introduced by J.F. Allen in , for the qualitative representation of time. It is an algebra based on 13 atomic relations between two time intervals shown in figure 4 ; these 13 relations are : b (before), m (meets), o (overlaps), s (starts), d (during), f (finishes ), eq (equals) and their inverse relations bi, mi, oi, si, di, fi.
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