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Table 1 Evolution of AMA and NCI-A and the reference alignment

From: Experiences from the anatomy track in the ontology alignment evaluation initiative

  AMA NCI-A Reference alignment
2007 2744 concepts, 3304 concepts, 1544 equivalence relations
  3 object properties, 2 object properties,  
  ca 4500 subsumption axioms ca 5500 subsumption axioms  
2008 Same as earlier Same as earlier Removed 20 correspondences
2010 Added 12 subsumption axioms Added 3 subsumption axioms Weakened 2 correspondences
  Removed 6 subsumption axioms Removed 3 subsumption axioms Removed 1 correspondence
   Added 17 disjointness axioms  
2011 Same as earlier Same as earlier Added 28 correspondences
    Removed 24 correspondences