如何在sparql中获取个人数据属性值 [英] How to get individuals data property value in sparql

问题描述

我是本体的新手.我已经通过Protege软件开发了餐厅本体.但是我非常需要一个SPARQL查询，该查询可以为一个类的所有个体查找属性值.

Hi i am in new to ontologies. I have developed a restaurant ontology by Protege software. But I badly need a SPARQL query that finds property values for all individuals of a class.

我想要得到这样的结果:

I want to get a result like:

Angels_n_Gypsies
House #30, Rd No. 19/A, Dhaka 1213, Bangladesh

推荐答案

只需遵循属性值...

Just follow the property values...

SELECT ?rname ?lname
WHERE {
   ?inst a :Popular_restaurant .
   ?inst :restaurant_name ?rname .
   ?inst :Location_name ?lname .
}

但这只是最终结果.了解SPARQL的一种方法是徒劳地开始.例如:

But that's just the end result. A way to understand SPARQL is to start pedantically. For example:

SELECT ?inst
WHERE {
   ?inst a :Popular_restaurant .
}

这使您成为该类的所有成员:Popular_restaurant.然后找到为每个成员定义了哪些属性:

That gets you all members of the class :Popular_restaurant. Then find what properties are defined for each member:

SELECT ?inst ?p ?o
WHERE {
   ?inst a :Popular_restaurant .
   ?inst ?p ?o .
}

p的绑定将告诉您为此类的成员定义了哪些属性.因此，请使用这些值来不断优化查询.

And the bindings for p will tell you what properties are defined for members of this class. So use those values to continuously refine the query.

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