Type and Role specialization*

• Type specialization (e.g. Living being _ Person)

  • New features affect identity
  • Both necessary and sufficient ICs can be added while specializing types

    • Polygon: same edges, same angles

      • Triangle: two edges, one angle
    • Living being: same DNA, etc...

      • Zebra: same stripes

• Role specialization (e.g. Person _ Student)

  • New features donít affect identity

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