CHORD Semantic Assumptions January, 2008. Unique Name Assumption User Defined Equality OID Equality UNA[a,b,c] = a  b  a  c  b  c a = b  b[m->v]

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Presentation transcript:

CHORD Semantic Assumptions January, 2008

Unique Name Assumption User Defined Equality OID Equality UNA[a,b,c] = a  b  a  c  b  c a = b  b[m->v]  c :: a c[m->v] a = b  b[m->v]  c :: a false

Domain Assumption Closed Domain Assumption Open Domain Assumption  x ( x : Person   y Father(x,y) ) Peter : Person Brother(Paul, John) Father(Peter, Paul)  Father(Peter, John)  x ( x : Person   y Father(x,y) ) Peter : Person Brother(Paul, John)  x Father(Peter, x)

Taxonomy Constraints Simple Inheritance Multiple Inheritance (No Constraints) X :: A  X :: B A :: B  B :: A  A = B

Multiple Inheritance Conflicts Resolution Source Based Value Based A :: B  A::C  B[m->T]  C[m->U]  T = U   V 1 A[m->V 1 ] A[m->T]

Unknown Information Handling Default Reasoning Minimal Information

Feature Inheritance Override By Default (Closed World Overriding) Open World Inheritance No Overriding A :: B  B[m->v]  X A[m->X]  (  V 1 ( A[m->V 1 ] )  A[m->v] ) A :: B  B[m->v] A[m->v]  [  V 1 ( A[m->V 1 ] ) ] ?