ODL_I³ Language

• Intensional/terminological relationships between terms t(class and attribute names)
  • <t1 SYN t2 > (Synonymy)
  • <t1 BT t2 > (Broader Terms - BT)
  • <t1 NT t2 > (Narrower Terms - NT)
  • <t1 RT t2 > (Related Terms - RT)
• Extensional Relationships between class names
  • <t1 SYN_ext t2 > the instance of C1 is the same of C2
  • <t1 BT_ext t2 > the instance of C1 contains the instance of C2
  • <t1 NT_ext t2 > the instance of C1 is contained into C2
• Mapping rules (to represent relationships between the integrated schema and the schema of a source)
• Union (to represent alternative data structures)
• optional (*) (to represent optional attributes)
• If then rules (to represent integrity coinstraints inter intra sources)

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