Category "rdf"

What is is the simplest way to setup a local rdf triple store with SPARQL endpoint?

For learning SPARQL it might be useful to have full control both over the query text and the data (RDF triples). While there are many public SPARQL endpoints av

Adding reference information to a skos:Concept

If I have a skos:Concept that represents some scientific term: PREFIX ex: <http://a.example/ex1#> PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

How to run SPARQL queries in R (WBG Topical Taxonomy) without parallelization

I am an R user and I am interested to use the World Bank Group (WBG) Topical Taxonomy through SPARQL queries. This can be done directly on the API https://vocab

Given an `RDF::Term` from the `RDF::Vocab` library, how do I infer the XSD datatype(s) I should expect?

I'm using Ruby scripts to to round-trip a SKOS vocabulary definition in Turtle format through to a spreadsheet (via CSV) and back to allow non-technical people

OpenRefine + RDF: handling repeated occurrences

Converting XML to RDF using OpenRefine with the RDF-extension. Here's a sample record in OR. I've been looking for a way to handle repeated occurrences, in thi

Wikidata ontology to Produce a larger subgraph by extracting the subgraphs of some relevant books, birthplace, education institutions, etc

I want to load the wikidata ontology in stardog studio to produce a larger subgraph by extracting the subgraphs of some relevant books, birthplace, education in

SPARQL: Variable must be included in group by clause

For every sosa:FeatureOfInterest (room), get the lowest temperature per day from the associated sensors for that room. There are 100 rooms. Each room has 3 sens

HTTPS connection with RDFLib

I am using Python and the RDFLib library and I want to perform an HTTPS connection to a SPARQL endpoint such as Amazon Nepute (HTTPS is mandatory) and perform a

How to use rdflib to represent Geometrical points in RDF data?

I am using rdflib to convert text files into n3 files for the purpose of saving bus station locations (GTFS).For example if we had latitude=8.0, longitude=5.0,

What tool does W3C use to render RDF files and documentation web pages?

The WCAT W3C page https://www.w3.org/TR/vocab-dcat-2/ is based in part on the RDF serialization of the DCAT RDF https://www.w3.org/ns/dcat2.ttl. What is the too