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    Theory
    of formal distinctions & connections about 
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    entities,
    relations, categories 
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    Properties:
    identity, rigidity, unity; what changes, what 
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    remains
    same? 
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    Part-whole
    relations: mereotopology, aggregation, 
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    mass/count
    (plurality) 
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    Levels:
    physical, functional, biological, intentional, 
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    social 
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    Taxonomic
    constraints 
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    Property
    analysis: legal agent, group, social entity, 
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    organization 
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