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我正在尝试将 RDF 文件加载到webvowl 中，但无法看到资源之间的关系，因为它们都是"External"。我的理解是，这是由于我如何引用文件中的资源（我以前没有做过的事情）。就我的用例而言，我正在编写一个描述具体（实例化）资源的 RDF 三元组的海龟文件——具体来说，使用 DCAT 本体来描述 API 的结构。

当我查看诸如 DCAT 之类的本体时，我可以看到它们使用哈希来分隔本体和资源 id，例如http://www.w3.org/ns/dcat#byteSize. 相比之下，我用来编写 Turtle 文件的代码生成器使用正斜杠来分隔本体和资源 ID，例如http://example.com/dataservices/{id}.

我尝试了各种斜杠/哈希组合，包括/排除文件扩展名无济于事。任何关于如何正确地自我引用这些 id 的建议将不胜感激。我试图可视化的资源关系示例如下所示，原始文件可以在这里找到，（当前无效的）可视化在这里。

@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/catalog-1> a dcat:Catalog ;
    dct:title "An Elexon dataset catalog"@en ;
    dcat:dataset <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/3519b2019120f09555a5e6b13de5e6ee405eb963>,
        <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/9e48ef6df2c415e78e2504f36a86054092434808>,
        <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/b63ddc4ec45655718cb8e29e9f05c312c360a127> ;
    dcat:service <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/c002eba1b6e86da2257235ff784433e06fc49ddf> .


<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/4107792ac75242bc833c888052ebef1f1e688ef7> a dcat:Distribution ;
    dcat:accessService <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/c002eba1b6e86da2257235ff784433e06fc49ddf> ;
    dcat:downloadURL <https://api.bmreports.com/BMRS/B0610/v1> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/53539e5e45daf8989e3b08f0aec6431a50a34aa2> a dcat:Distribution ;
    dcat:accessService <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/c002eba1b6e86da2257235ff784433e06fc49ddf> ;
    dcat:downloadURL <https://api.bmreports.com/BMRS/B0620/v1> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/ec0dcc1fe3d8ad6ba208b0a9a892a3f96dc6c12d> a dcat:Distribution ;
    dcat:accessService <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/c002eba1b6e86da2257235ff784433e06fc49ddf> ;
    dcat:downloadURL <https://api.bmreports.com/BMRS/B0630/v1> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/9e48ef6df2c415e78e2504f36a86054092434808> a dcat:Dataset ;
    dct:description "Actual Total Load per Bidding Zone"@en ;
    dct:title "B0610"@en ;
    dcat:distribution <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/4107792ac75242bc833c888052ebef1f1e688ef7> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/b63ddc4ec45655718cb8e29e9f05c312c360a127> a dcat:Dataset ;
    dct:description "Day-Ahead Total Load Forecast per Bidding Zone"@en ;
    dct:title "B0620"@en ;
    dcat:distribution <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/53539e5e45daf8989e3b08f0aec6431a50a34aa2> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/3519b2019120f09555a5e6b13de5e6ee405eb963> a dcat:Dataset ;
    dct:description "Week-Ahead Total Load Forecast per Bidding Zone"@en ;
    dct:title "B0630"@en ;
    dcat:distribution <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/ec0dcc1fe3d8ad6ba208b0a9a892a3f96dc6c12d> .

<https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.ttl/c002eba1b6e86da2257235ff784433e06fc49ddf> a dcat:DataService ;
    dct:description "API for the Elexon Balancing Mechanism Reporting Service"@en ;
    dct:title "BMRS API"@en ;
    dcat:endpointDescription <https://raw.githubusercontent.com/OSUKED/ElexonDataPortal/master/data/BMRS_API.yaml> ;
    dcat:endpointURL <https://api.bmreports.com> .
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