我可以在SPARQL查询中组合本地和远程数据集吗？ [英] Can I combine local and remote dataset within SPARQL query?

问题描述

我一直在阅读关于SPARQL和RDF，如果我对这些技术的推断是错误的，请纠正我们。

I've been reading about SPARQL and RDF and please correct me if my reasoning about these technologies is wrong here.

假设我们有一个本地SPARQL数据库LOCAL ..和url到远程RDF文件称为URL_RDF。我可以写一个脚本让我们在PHP中做这样的SPARQL查询吗？

Assuming that we have a local SPARQL database called LOCAL.. and url to remote RDF file called URL_RDF. Can I write a script lets say in PHP which will do a SPARQL query like this ?

伪代码。

SELECT * FROM LOCAL,URL_RDF WHERE LOCAL.id=URL_RDF.id

换句话说，我可以在SPARQL查询中结合源代码（远程文件+本地db）？

In other words can I combine sources within SPARQL query like this (remote file + local db) ?

推荐答案

请使用SPARQL 1.1中的联合功能执行此操作。有关详情，请参阅 http://www.w3.org/TR/sparql11-federated-query ，但是为了给你一个快速的印象，它的样子，你的示例查询将是这样（仍然是伪代码）：

You can do this using the federation features in SPARQL 1.1. These are described at http://www.w3.org/TR/sparql11-federated-query, but to give you a quick impression of what it looks like, your example query would be something like this (still in pseudocode):

SELECT * WHERE {
  # the local part of the query
  ?s ?p ?id

  SERVICE <http://url/to/remote/data> {
    # The remote part of the query
    ?x ?y ?id
  }
}

请注意，URL必须指向SPARQL端点，即可以响应SPARQL查询的服务器，而不仅仅是远程RDF文件。

Note that the URL would have to point to a SPARQL endpoint, i.e. a server that can respond to SPARQL queries, and not just a remote RDF file.

这篇关于我可以在SPARQL查询中组合本地和远程数据集吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！