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?