Querying datasets created by csv2rdf4lod

Other pages showing queries

• Namespace prefix handling
• Dataset composition resulting from naming by source, dataset, and version
• Aggregating subsets of converted datasets
• Querying HTTP redirect provenance to find new dataset versions
• Provenance

What version of the converter was used?

Show a time line of which version of the converter was used, how many datasets were converted with it (results):

PREFIX dcterms:    <http://purl.org/dc/terms/>
PREFIX doap:       <http://usefulinc.com/ns/doap#>
PREFIX pmlp:       <http://inference-web.org/2.0/pml-provenance.owl#>
PREFIX pmlj:       <http://inference-web.org/2.0/pml-justification.owl#>
PREFIX conversion: <http://purl.org/twc/vocab/conversion/>

SELECT distinct max(?date) as ?modified ?engine ?revision count(?dataset) as ?count  
WHERE {
  GRAPH <http://logd.tw.rpi.edu/vocab/Dataset>  {

    ?dataset a conversion:VersionedDataset; 
             void:dataDump ?dumpFile .
    optional { ?dataset dcterms:modified ?date }

    ?ns pmlj:hasConclusion ?dumpFile;
        pmlj:isConsequentOf [
           a pmlj:InferenceStep;
           pmlj:hasInferenceEngine ?engine
        ]
    .
    optional { ?engine doap:revision      ?revision   }
  }
} group by ?engine ?revision order by ?modified ?count

Drafts

Is there a way to know which datasets are fully loaded in the sparql endpoint?

was there any update on this question? Is running the sparql query as below at http://logd.tw.rpi.edu/sparql return the complete list of loaded datasets?

PREFIX conversion: <http://purl.org/twc/vocab/conversion/>
SELECT ?g sum( ?triples ) as ?estimated_triples
WHERE {
  GRAPH ?g  {
   ?g void:subset ?subdataset .
   ?subdataset conversion:num_triples ?triples .
   filter regex(?g, "data-gov")
  }
} 
GROUP BY ?g

bad sources: prefix dcterms: http://purl.org/dc/terms/ prefix conversion: http://purl.org/twc/vocab/conversion/

SELECT count(distinct ?organization) as ?count
WHERE {    
  graph <http://logd.tw.rpi.edu/vocab/Dataset> {      
    ?dataset a conversion:Dataset;
             dcterms:source ?organization .
    filter(!regex(str(?organization),".*provenance_file.*"))
  }
}

Latest version of a dataset

results:

PREFIX void:    <http://rdfs.org/ns/void#>
PREFIX dcterms: <http://purl.org/dc/terms/>

SELECT ?subset ?modified
WHERE {
  GRAPH <http://logd.tw.rpi.edu/vocab/Dataset> {
    <http://logd.tw.rpi.edu/source/data-gov/dataset/92> void:subset ?subset .
    optional { ?subset dcterms:modified ?modified }
  }
}order by desc(?modified)

latest dump file

Alvaro is using this query http://logd.tw.rpi.edu/query/logd-data-list-latest-dump-file-for-dataset.sql to obtain the latest dump for a dataset. However they appear only for some datasets (see http://logd.tw.rpi.edu/datasets)

PREFIX foaf:       <http://xmlns.com/foaf/0.1/>
PREFIX dcterms:    <http://purl.org/dc/terms/>
prefix conversion: <http://purl.org/twc/vocab/conversion/>

SELECT distinct ?dataset ?dump_file
WHERE {

 graph <http://logd.tw.rpi.edu/vocab/Dataset> {
       ?dataset
            a conversion:Dataset;
            void:subset ?version .
       ?version a conversion:VersionedDataset .

  optional {
   ?version void:subset  ?layer .
   {
    {
     ?layer 
            void:dataDump ?dump_file ;
            dcterms:created ?creationtime .
    }
    UNION
    {
     ?descriminator conversion:num_triples ?triples .
     ?layer  
             void:dataDump ?dump_file ;
             dcterms:created ?creationtime .
    }
   }
  }
 }
}
ORDER BY DESC(?creationtime)

Historical notes

• http://tw.rpi.edu/wiki/tw:17_Sept_2010_SWC_LOG_notes
• http://logd.tw.rpi.edu/tutorial/exploring_logd_metadata_with_sparql
• http://logd.tw.rpi.edu/tutorial/How_to_find_datasets_using_the_LOGD_sparql_endpoint
• http://code.google.com/p/data-gov-wiki/issues/detail?id=35

(a few more sprinkled around)

Provenance queries

Trying to get to the param files (so we can count their triples so quantify effort to create them).

Use case: find the parameters used during the conversion. (querying this is now difficult and needs to be eased)

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX pmlp: <http://inference-web.org/2.0/pml-provenance.owl#>
PREFIX pmlj: <http://inference-web.org/2.0/pml-justification.owl#>

PREFIX conversion: <http://purl.org/twc/vocab/conversion/>
SELECT distinct ?conclusion
WHERE {
  GRAPH <http://logd.tw.rpi.edu/vocab/Dataset>  {
    ?versioned rdf:first ?thing .
    ?thing pmlj:hasConclusion ?conclusion .
    ?conclusion pmlp:hasFormat <http://inference-web.org/registry/FMT/RDFAbstractSyntax.owl#RDFAbstractSyntax> .
  }
}

Finding all of the sources:

PREFIX pmlp: <http://inference-web.org/2.0/pml-provenance.owl#>
PREFIX irw:  <http://www.ontologydesignpatterns.org/ont/web/irw.owl#>

SELECT ?url
WHERE {
  GRAPH <http://logd.tw.rpi.edu/vocab/Dataset> {
               ?url a pmlp:Source .
    optional { ?url irw:redirectsTo ?none }
                      filter(!bound(?none))
  }
}