“someValuesFrom”和“someValuesFrom”有什么区别? 和“allValuesFrom”?
在描述逻辑中,“someValuesFrom”和“allValuesFrom”有什么区别? 换句话说,(有限的存在量化)和(价值限制)之间的差异。
例如,考虑一下:
Δ = {a, b, c, d, e}
ext(B) = {
ext(R) = {, ,
那么以下有什么区别呢?
ext(∃R.B) = ?
ext(∀R.B) = ?
有什么办法可以简化 somevaluefrom 和 allvaluesfrom 的概念吗?
In description logic, what is the difference between "someValuesFrom" and "allValuesFrom"?
In other words, the difference between (limited existential quantification) and (value restriction).
For example, consider this:
∆ = {a, b, c, d, e}
ext(B) = {<c,d>}
ext(R) = {<a,b>, <a,c>, <d,c>, <c,e>}
So what is the difference between the following?
ext(∃R. B) = ?
ext(∀R. B) = ?
Is there any way to simplify the concept of somevaluefrom and allvaluesfrom?
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首先,
allValuesFrom
和someValuesFrom
听起来像 OWL,并且在 规范。在 OWL(一种 DL 语言)的上下文中,它们表示对属性的限制,尤其是对属性值的类的限制,这意味着您想要声明一个
Car
,它有一个manufactured_by
属性,此属性仅限于Manufacturer
类的成员。allValuesFrom
和someValuesFrom
在某种意义上有所不同,第一个要求属性值的所有值,后者至少有一个属于某个类。First,
allValuesFrom
andsomeValuesFrom
sound like OWL, and they are explained with examples in the specification.In the context of OWL (which is a DL language) they respresent restrictions on properties, especially on the class of the property values, meaning e.g. that you want to state that a
Car
, which has amanufactured_by
property, this property is restricted to members of the ClassManufacturer
.allValuesFrom
andsomeValuesFrom
differ in the sense, that the first requires all values of the property values, the latter at least one to be of a certain class.