16
Simple Example: Semantics of Date Across Applications
•System1 Instance of Concept: Date1
–Attribute: YR = Int
1
–Attribute: MO =
String “Aug”
–Attribute: DY = Int
12
•System2: Instance of
Concept = Date2
–Attribute:
DayOfWeek = Sunday
–Attribute: ActualDate
=
String
“12082001”
•Semantically
Equivalent? Then How?
DATE
2
DayOfWeek
ActualDate
DATE
1
MO
YR
DY
Exactly Semantically Equivalent to?
No: Approximately Semantically Equivalent to. So Mappings and Transformations are Needed!
Add
Assertions, Apply Transformations (directional)
Once Assertions,
Transformations Defined: become part
of Integration Ontology &
Reused
Date2.ActualDate » Date1.DY Ù Date1.MO Ù Date1.YR