cannot access RDF Document (Named Graph) IRIs:

问题

I am trying to learn Virtuoso, and I tried for 'Generating Linked Data Views from Relational Data Sources'. I got the URN and try executing the SPARQL execution. with following details:

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

I got output like this:

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

Now when i tried to access the links mentioned in above table, i get error. location not found.

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'

Any help or suggestions are more than welcomed. Thank you.

回答1:

It seems likely you haven't followed the documentation, Automated Generation of Linked Data Views over Relational Data Sources with Virtuoso, and so haven't installed the cartridges_dav.vad and fct_dav.vad VAD packages, which bring the /about/ page which is giving you the 404.

Note that there are different VAD builds for use with each of Commercial and Open Source Virtuoso, and these should generally be matched to the Virtuoso version in use.

VADs for Virtuoso v7.2 Commercial Editions
VADs for VOS (Virtuoso Open Source) v7.2

ObDisclaimer: OpenLink Software produces Virtuoso, and employs me.

来源：https://stackoverflow.com/questions/42573108/cannot-access-rdf-document-named-graph-iris

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