Enrichment service using templates 4, 5 and 7 - Response 500

[borriellom]

Using one of the templates listed in the object, the enrichment service always returns a 500 response. Maybe it is due to problems at sparql endpoints: Templates 4 and 7: http://linkedgeodata.org/vsnorql Template 5: http://europeana.ontotext.com/sparql

Example

Request POST URL: http://api-dev.freme-project.eu/current/e-link/documents/?outformat=json-ld&templateid=4 HEADER "Content-Type" = "text/turtle"

Input Text

@prefix nif:   <http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#> .
@prefix itsrdf: <http://www.w3.org/2005/11/its/rdf#> .
<http://127.0.0.1:9995/spotlight#char=0,15>
        a                     nif:Context , nif:Sentence , nif:RFC5147String ;
        nif:beginIndex        "0" ;
        nif:endIndex          "15" ;
        nif:isString          "This is Berlin." ;
        nif:referenceContext  <http://127.0.0.1:9995/spotlight#char=0,15> .

<http://127.0.0.1:9995/spotlight#char=8,14>
        a                     nif:Word , nif:RFC5147String ;
        nif:anchorOf          "Berlin" ;
        nif:beginIndex        "8" ;
        nif:endIndex          "14" ;
        nif:referenceContext  <http://127.0.0.1:9995/spotlight#char=0,15> ;
        itsrdf:taIdentRef     <http://dbpedia.org/resource/Berlin> .

Response Error 500

[m1ci]

will you be so kind and share cURL test commands?

[borriellom]

Template 5 has worked now. The issue is only for templates 4 and 7. Find below the requests. The input file is in the first comment.

curl -X POST -d @nifFile.ttl "http://api-dev.freme-project.eu/current/e-link/documents/?outformat=json-ld&templateid=4" -H "Content-Type:text/turtle" -v

curl -X POST -d @nifFile.ttl "http://api-dev.freme-project.eu/current/e-link/documents/?outformat=json-ld&templateid=7" -H "Content-Type:text/turtle" -v

[m1ci]

Thanks for the cURL examples!

Template 5 has worked now.

Great, the SPARQL endpoint was probably down or busy.

The issue is only for templates 4 and 7.

The actual problem here is not with the templates or the e-Link implementation but with the SPARQL endpoints. The SPARQL enpoints implemented with Virtuoso work out-of-the box with e-link and Jena, however, the vsnorql endpoints (the Linked Geo Data endpoint used in template 4 and 7) due to unknown problem are not compatible with Jena.

@Jan: since this is bug related to the SPARQL endpoint itself (not the e-Link impl) can we leave this issue open and I'll get back to it as soon as I get back at work (mid August)?

[jnehring]

Ok lets leave this issue open

[jnehring]

@m1ci any update here?

[m1ci]

not yet, this should be solved with adopting these templates linked data fragments https://github.com/freme-project/e-Link/issues/29 We are working on it.

[m1ci]

linked data fragments will be adopted in early in the development of FREME 4.0.

[m1ci]

this issue can be closed - the issue is covered by https://github.com/freme-project/e-Link/issues/40 and https://github.com/freme-project/e-Link/issues/39