Question

鉴于此数据结构

@prefix core <http://www.w3.org/2004/02/skos/core#> 
<http://localhost/myvocab/1> core#notation 1 .
<http://localhost/myvocab/1> <http://www.w3.org/2006/time#inDateTime> <http://localhost/myvocab/item1#DateDescription> .

<http://localhost/myvocab/item1#DateDescription> <http://www.w3.org/2006/time#year>  2016 ;
            <http://www.w3.org/2006/time#month>  "June"

如果我跑

select * where {?s ?p ?o . 
                    <http://www.w3.org/2004/02/skos/core#notation> 1 . }

然后只返回前两个三元组（:hasID和:hasTime）。是否存在sparql查询（最好不使用正则表达式过滤器来匹配id）以从子命名空间返回所有三元组？

我希望我可以达到某种结果

-------------------------------------------------------------------------------------------------------------------------------------------------------
| s                                                | p                                              | o                                               |
=======================================================================================================================================================
| <http://localhost/myvocab/item1>                 | <http://www.w3.org/2006/time#inDateTime>       | <http://localhost/myvocab/item1#DateDescription |
| <http://localhost/myvocab/item1>                 | <http://www.w3.org/2004/02/skos/core#notation> | 1                                               |
| <http://localhost/myvocab/item1#DateDescription> | <http://www.w3.org/2006/time#month>            | "June"                                          |
| <http://localhost/myvocab/item1#DateDescription> | <http://www.w3.org/2006/time#year>             | 2016                                            |
-------------------------------------------------------------------------------------------------------------------------------------------------------

Answer 1

如果您提供我们可以实际加载的数据以及您尝试过的属性形成的查询，这总是有帮助的。您显示的数据实际上并不合法，您提供的查询也不合法。以下是一些实际可加载的示例数据：

@prefix core: <http://www.w3.org/2004/02/skos/core#> 

<http://localhost/myvocab/1> core:notation 1 ;
                             <http://www.w3.org/2006/time#inDateTime> <http://localhost/myvocab/item1#DateDescription> .

<http://localhost/myvocab/item1#DateDescription> <http://www.w3.org/2006/time#year> 2016 ;
                                                 <http://www.w3.org/2006/time#month>  "June"

如果我理解你，你也想要遵循：item1_DateTime对象的属性。您可以使用以下属性路径执行此操作：item1＆＃39; s属性和值，依此类推。在此查询中，我使用（：|！：）作为通配符，因为每个属性都是：或者它不是。最后的 * 表示遵循任意长度的路径。

prefix core: <http://www.w3.org/2004/02/skos/core#>

select ?s ?p ?o where {
  ?s_ core:notation 1 ;
      (<>|!<>)* ?s .
  ?s ?p ?o .
}

--------------------------------------------------------------------------------------------------------------------------------------------------
| s                                                | p                                        | o                                                |
==================================================================================================================================================
| <http://localhost/myvocab/1>                     | <http://www.w3.org/2006/time#inDateTime> | <http://localhost/myvocab/item1#DateDescription> |
| <http://localhost/myvocab/1>                     | core:notation                            | 1                                                |
| <http://localhost/myvocab/item1#DateDescription> | <http://www.w3.org/2006/time#month>      | "June"                                           |
| <http://localhost/myvocab/item1#DateDescription> | <http://www.w3.org/2006/time#year>       | 2016                                             |
--------------------------------------------------------------------------------------------------------------------------------------------------

在SPARQL查询中使用名称空间

1 个答案: