如何使用SPARQL查询生成适合特定节点类型或/和边缘类型的所有三元组？ [英] How to generate all triples that fit a particular node type or/and edge type using SPARQL query?

问题描述

这是一个后续问题：

我在找什么现在要做的是生成如下模式：
$ b $ 1纸（节点）-bywriteby（边）-author（节点）
2）纸（节点） - iscitedby（edge）-paper（node）
等等...
，然后从数据集中生成所有满足这些模式的三元组。

解决方案

我想你要找的是

 构造{
 ？论文：isWrittenBy？作者。 
？paper：isCitedBy？paper2 
} 
其中{
？paper：isWrittenBy？author。 
？paper：isCitedBy？paper2 
} 
  

关于构造查询的spec部分可能是一个有用的参考。

It is a follow up question to :

How to list and count the different types of node and edge entities in the graph data using SPARQL query?

So assuming I have the different node entities and edge entities of a given graph, how do I go about listing all triples, given a node-edge-node pattern? And how do I generate ALL node-edge-node patterns given the node and edge entities?

Example: If there is a network consisting of papers(nodes), authors(nodes), conferences(nodes), iswrittenby(edge), ispublishedin(edge), presentsin(edge) and so on , I'd have node entity type : papers authors conferences and for edge entity type: iswrittenby, ispublishedin , presentsin etc

What I'm looking to do now is generate patterns like:

1) paper(node)-iswrittenby(edge)-author(node) 2) paper(node)-iscitedby(edge)-paper(node) and so on... and then generate all triples from the dataset which satisfy these patterns.

解决方案

I think what you're looking for is

construct {   
  ?paper :isWrittenBy ?author .
  ?paper :isCitedBy ?paper2
}
where {
  ?paper :isWrittenBy ?author .
  ?paper :isCitedBy ?paper2
}

The spec section on construct queries might be a helpful reference.

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