无法访问 RDF 文档（命名图）IRI：

Question

我正在努力学习 Virtuoso，我尝试了 'Generating Linked Data Views from Relational Data Sources'。我得到了 URN 并尝试执行 SPARQL 执行。详细信息如下：

Default Graph IRI: urn:localhost:8890:CSV
Query:
SELECT * 
FROM <urn:sparql:tests:create:data> 
WHERE 
  {
    ?s ?p ?o
  }

我得到这样的输出：

s                                                        p                                               o
http://localhost:8890/CSV/emp_csv/DEPTNO/1#this         http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://localhost:8890/schemas/CSV/emp_csv
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://localhost:8890/schemas/CSV/dept_csv
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://localhost:8890/schemas/CSV/              7369
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://localhost:8890/schemas/CSV/ename         "smith"
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://localhost:8890/schemas/CSV/job           "clerk"
http://localhost:8890/CSV/emp_csv/DEPTNO/1#this         http://localhost:8890/schemas/CSV/deptno        10
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://localhost:8890/schemas/CSV/deptno        10
http://localhost:8890/CSV/emp_csv/DEPTNO/1#this         http://localhost:8890/schemas/CSV/dname         "appserver"
http://localhost:8890/CSV/emp_csv/DEPTNO/1#this         http://localhost:8890/schemas/CSV/loc           "newyork"
http://localhost:8890/CSV/emp_csv/DEPTNO/1#this         http://localhost:8890/schemas/CSV/id             1
http://localhost:8890/CSV/dept_csv/EMPNO/1#this         http://localhost:8890/schemas/CSV/id             1

现在，当我尝试访问上述 table 中提到的链接时，出现错误。找不到位置。

For example if i select: http://localhost:8890/CSV/emp_csv/DEPTNO/1#this

I get the selected link addressed to: http://localhost:8890/about/html/http://localhost:8890/CSV/emp_csv/DEPTNO/1#this

and the page shows: Error HTTP/1.1 404 File not found

The requested URL was not found URI = '/about/html/http:/localhost:8890/CSV/emp_csv/DEPTNO/1'

我们非常欢迎任何帮助或建议。谢谢。

Answer 1

您似乎没有遵循文档 Automated Generation of Linked Data Views over Relational Data Sources with Virtuoso，因此没有安装 cartridges_dav.vad 和 fct_dav.vad VAD 包，它们带来了 /about/ 页面为您提供 404.

请注意，每个 Commercial and Open Source Virtuoso 都有不同的 VAD 版本，这些通常应与使用的 Virtuoso 版本相匹配。

ObDisclaimer：OpenLink Software produces Virtuoso，并雇用了我。

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