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Questions tagged [turtle-rdf]

Turtle is a textual syntax that allows RDF graphs to be written in a compact and natural text form, with abbreviations for common usage patterns and datatypes

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Turtle (Terse RDF Triple Language) is a format for expressing data in the Resource Description Framework () data model with a syntax similar to . RDF, in turn, represents information using "triples", each of which consists of a subject, a predicate, and an object. Each of those items is expressed as a Web URI. Hence Turtle provides levels of compatibility with the existing and formats as well as the triple pattern syntax of .

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How can I link a literal value with another one in rdf graph?

I know that in RDF subjects can't be literals. However, let's say that I have a few properties and classes (in turtle syntax) already defined like this: foaf:Organization a owl:Class . ex:Employee a owl:Class . foaf:Project a owl:Class…
Plutone11011
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Can a .ttl Turtle file have two empty prefixes?

It it possible to have a Turtle file with two empty prefixes? Imagine that we have a .ttl file with this prefixes declaration: @prefix : . @prefix ex2: . @prefix ex3:…
tremendows
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How do I add a start and end time to a RDF triple?

Supposing we have the following triple in Turtle syntax: . How do I add a start and end time? For example if I want to say he started at 10 am and finished his 10miles…
user3352632
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Import RDF: are referenced blank nodes gonna be merged or handled separately?

When importing RDF into a triple store: Are referenced blank nodes (as object) gonna be merged or handled separately, as if they are distinct? Example RDF to import into a triple store: @prefix ex: . ex:foo ex:bar [ ex:baz 42 ], [ …
k00ni
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Wikidata on local Blazegraph : Expected an RDF value here, found '' [line 1]

We (Thomas and Wolfgang) have installed locally wikidata and blazegraph following the instruction here : https://github.com/wikimedia/wikidata-query-rdf/blob/master/docs/getting-started.md The mvn package command was successful [INFO]…
Thomas Scialom
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Rdflib.js, how to serialize the data into turtle (.ttl) format?

How can I serialize RDF in turtle using rdflib.js? There's not much documentation. I can use: Serializer.statementsToN3(destination); to serialize into the N3 format, but not much besides that. I've tried altering the aforementioned command to…
Fox
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How to tell that two variables have different values in SPARQL

I'm studying SPARQL and I have a doubt about queries. Suppose I have a simple ontology like the following :Jack a :Worker ; :worksAt :Project1,:Project2 :Bob a :Worker ; :worksAt :Project2,:Project3 :Mike a :Worker ; :worksAt…
Stefano Kira
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Reduce string length of query sparql with fuseki

When I start a Fuseki server, I use this command : fuseki-server --config=config-orphadata.ttl In this ttl file, I can writte some prefix rules : @prefix orphanet: . @prefix ORDO:…
Matthieu
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Fuseki 1.0.1 SPARQL Update returns 404

I'm trying to learn to update data in Fuseki, but when I try I get a 404 error. I am clearly not doing something right. Perhaps it is my INSERT command? I've tried a ton of them though. I am using the web based SPARQL interface at /sparql.tpl.…
MeowCode
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How to impose the uniqueness of data property values via SHACL

I cannot figure out how to impose the uniqueness of a data property value via SHACL. The following excerpts are lite versions of the examples presented by Henriette Harmse in her personal blog. Suppose we have the following data: @prefix ex:…
Stratos K
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Fetching triples using SPARQL query from turtle file

I am new to SPARQL and currently struglling to fetch triples from a turtle file. ### https://ontology/1001 rdf:type owl:Class ; rdfs:subClassOf ; …
rshar
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How to add external variables to a SPARQL query?

I have the following codes: name = [str(s) for s, in graph.query(''' SELECT ?lbl WHERE { ?obj . ?obj rdfs:label ?lbl . } …
Ohrwurm
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Read Turtle file and query the graph using SPARQL

I am in a learning phase of SPARQL so excuse if the question sounds basic. I am exploring SPARQLWrapper to connect to a SPARQL endpoint to fetch some data. Below is the query. sparql = SPARQLWrapper("http://patho.phenomebrowser.net/sparql/")…
rshar
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Verify rdf:Container(rdf:Seq) using shacl constraints

I am currently trying to build a constraint validation shape for an incoming object of the type rdf:Seq. The shacl shapes I have used, use the path to identify triple and then add additional constraint validations on datatype, length and count. But,…
Shri
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How to configure RDFWriter to explicit write data type in literals?

I'm saving a TTL file using RDFWriter. How can I explicitly save literals with their data type? For example, I want "5.36289"^^xsd:float but I get 5.36289E0 instead. I had the same problem with strings, but I found the…
Alessio Palmero Aprosio
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