CONSTRUCT/WHERE 中的 SPARQL 函数 [英] SPARQL functions in CONSTRUCT/WHERE

问题描述

我在处理查询时主要使用 SPARQL SELECT 以进行调试，但最后我想以 CONSTRUCT 方式使用最终结果；因为我想使用图表而不是键/值查询结果.

I mostly use SPARQL SELECT while working on a query for debugging purposes but in the end I want to use the final result it in a CONSTRUCT way; as I want to work with a graph and not key/value query results.

我还没有得到(并且似乎无法通过搜索引擎/文档找到)是我是否也可以以这种方式使用函数.例如，我使用属性路径将标题连接到超字符串"中，稍后我将使用它来构建 Lucene 索引以提高纯文本搜索质量:

What I don't get yet (and can't seem to find with search engines/docs) is if I can use functions as well that way. As an example, I use a property path to concatenate titles I get into a "superstring", which I later use for building a Lucene index to increase plain text search quality:

PREFIX dc: <http://purl.org/dc/elements/1.1/>    

SELECT (group_concat(?title ; separator = " ") AS ?fancytitle) WHERE { 
  GRAPH ?graph {
    <http://data.staatsarchiv-bs.ch/id/archivalresource/CH-000027-1/pa-633c-a-312-fasc-163>  dc:relation+ ?relation .
    ?relation dc:title ?title .
  }
}

现在我想拥有与新三元组相同的 ?fancytitle

Now I would like to have the same ?fancytitleas a new triple like

<http://data.staatsarchiv-bs.ch/id/archivalresource/CH-000027-1/pa-633c-a-312-fasc-163> <fancytitle> ?fancytitle .

所以我可以直接将它存储在一个新的图表中.这可能吗?我尝试了一些查询，但无法让 SPARQL 处理器接受它.仅供参考，我正在使用 Fuseki.

So I can store it directly in a new graph. Is this possible? I played with some queries but couldn't manage to get it accepted by the SPARQL processor. FYI I'm using Fuseki.

您可以在我的 SPARQL端点

推荐答案

在我同事的帮助下，我们得到了它的工作，UNION 和 GROUP BY 是必不可少的.此查询将图中所有 locah:ArchivalResource 的字符串放在一起:

With the help of my colleague we got it to work, UNION and GROUP BY are essential. This query puts the string together for all locah:ArchivalResource in the graphs:

CONSTRUCT
{
  ?archresource skos:hiddenLabel ?supertitle
}
WHERE
{
  SELECT ?archresource  (group_concat(?title ; separator = ", ") AS ?supertitle) WHERE {
    GRAPH ?graph {
      {
        SELECT ?title ?archresource WHERE {
          GRAPH ?graph {
            {
              ?archresource a locah:ArchivalResource ;
              dc:title ?title .
            } UNION
            {
              ?archresource dc:relation+ ?relation .
              ?relation dc:title ?title .
            }
          }
        }
      }
    }
  } GROUP BY ?archresource
}

这篇关于CONSTRUCT/WHERE 中的 SPARQL 函数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！