如何将模型检查逻辑查询转换为SPARQL查询?

问题描述

假设我具有以下RDF数据:

Suppose I have the following RDF data:

@prefix : <urn:ex:>

:m  :A  "a"
:m  :A  "b"
:m  :A  "c"
:m  :B  "a"
:m  :B  "b"

我可以使用哪种SPARQL查询来检查RDF模型是否满足以下逻辑公式?

What SPARQL query could I use to check whether the RDF model satisfies the following logical formula?

∀x A(X) → B(x)

推荐答案

SPARQL没有条件或通用量化，但是具有存在性(是否与之匹配?)，(隐式)合取和否定(在不存在"中) ").

SPARQL doesn't have conditionals or universal quantification, but does have existentials (does anything match this?), (implicit) conjunction and negation (in the 'absence' sense).

所以重写问题:

∀x A(x) → B(x) ⇒
∀x ¬ ( A(x) ∧ ¬ B(x) ) ⇒
¬ ∃x A(x) ∧ ¬ B(x)

这是SPARQL可以做的，差不多:

and that's something SPARQL can do, pretty much:

# Is there anything of type A but not B?
ASK {
  { ?x a :A } MINUS { ?x a :B }
}

如果违反任何约束条件，此查询将返回 true .

This query returns true if there are any violations of the constraint.

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