Relationship Types
a). One-to-one (1:1): means that an occurrence if one OT uniquely determines an occurrence of other OT - and vice-versa
b). One-to-many (1:n): means that an occurrence of one OT determines an occurrence of the other OT - but not vice-versa
c). Many-to-many (n:m):means that an occurrence of one OT can be related to many occurrences of other OT - and vice-versa