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?