Such as for example reps happen however whenever details is actually instantiated that have constants
Bags are employed here because the order of the attribute/value pairs in a frame is immaterial and the pairs may repeat. For instance, o[a->b a->b]. For instance, o[?A great->?B ?C->?D] becomes o[a->b an excellent->b] if variables ?A and ?C are instantiated with the symbol a and ?B, ?D with b. (We shall see later that o[a->b an excellent->b] is equivalent to o[a->b].)
The operator ## is required to be transitive, i.e., cstep one ## c2 and c2 ## c3 must imply c1 ## c3. This is ensured by a restriction in Section Interpretation of Formulas.
# and ## are required to have the usual property that all members of a subclass are also members of the superclass, i.e., o # cl and cl ## scl must imply o # scl. This is ensured by a restriction in Section Interpretation of Formulas.
For every outside schema, ?, associated with the language, Iexternal(?) is assumed to be specified externally in some document (hence the name external schema). ? is a schema of a RIF built-in predicate or function, Iexternal(?) is specified in [RIF-DTB] so that:
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- If ? is a schema of a built-in function then Iexternal(?) must be the function defined in the aforesaid document.
- If ? is a schema of a built-in predicate then Iknowledge? (Iexternal(?)) (the composition of Itruth and Iexternal(?), a truth-valued function) must be as specified in [RIF-DTB].
Further restrictions on the interaction of this function with Itruth will be imposed in order to ensure the intended semantics for each conjunctive and quantifier. For aggregates, Iconnective maps them to functions D > D and additional restrictions are imposed on the mapping I defined below.
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Particularly, in the event the
I and define another identity-interpreting mapping on the well-shaped conditions, and that we signify using the same symbol I which is used for the semantic build alone. (más…)