Database Reference
In-Depth Information
Figure 6: Example 4. Fuzzy completeness constraint on an attribute-defi ned specialization
with the defi ning attribute Contract_Type
Figure 7: Examples 5 and 6. Fuzzy completeness constraint and fuzzy cardinality constraint
on an overlapping specialization
In a new expression for fuzzy completeness constraints, we can use a fuzzy (min,max)
notation instead of one quantifi er. These minimum and maximum values restrict the quantity
of superclass instances which belong to “any” subclass. This extension is not very useful.
FUZZY CARDINALITY CONSTRAINT ON
OVERLAPPING SPECIALIZATIONS
In an overlapping specialization under the FuzzyEER model, we can also establish the
minimum and maximum number of subclasses to which each member of the superclass can
belong in a fl exible manner. This can easily be expressed using the fuzzy (min,max) nota-
