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Questions tagged [rdflib]

RDFLib is a Python library for working with RDF. It supports parsers and serializers for different syntaxes (RDF/XML, N3, N-Triples, Turtle, TriX and RDFa) as well of remote and local SPARQL queries. Please do not use this tag for rdflib.js.

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Please do not confuse the RDFLib Python library with the rdflib.js Javascript library.

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Loading RDF data to PostgreSQL Table through RDFLib-SQLAlchemy

I have a large RDF dataset (Geonames dataset: 18GB) in NT format. I would like to load it into a PostgreSQL relational table by using rdflib_sqlalchemy.SQLAlchemy. I know that it is doable (performing sparql query on the rdf data stored in…
Beautiful Mind
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Check ontology consistency with RDFlib and python

I am using RDF lib with python. Is it there any function that controls if an ontology is inconsistent. < owl:Class rdf:about="http://www.semanticweb.org/ontologies/2016/1/semantic_mapping_domain_model#Chair"> < owl:equivalentClass…
UserK
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how to retrieve the namespace of an ontology loaded by rdflib

I created an ontology and now I want to read it using rdflib. the question is how to get the URI (namespace) or the prefix of the loaded graph with out manually inspecting the ontology as below: from rdflib import…
msc87
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JSON-LD @id with IRI results in blank node

I have a small JSON file hosted on a local web server with the following content: json_source = {"key1": "azerty", "key2": "qwerty", "key3": "lorem", "key4": "ipsum"} Using the RDFLib library, I'm parsing the JSON, adding some semantics using the…
Brainlock
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How to instantiate an ontology using rdflib?

I have an ontology where I have defined series of classes, subclasses and properties. Now I want to automatically instantiate the ontology with Python code and save it in RDF/XML again and load it in Protege. I have written the following code: def…
msc87
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The same query on Sparql gives different results

I read some questions related to my question, like Same sparql not returning same results, but I think is a little different. Consider this query which I submit into http://live.dbpedia.org/sparql (Virtuoso endpoint) and get 34 triples as a result.…
Marcelo
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Text from RDF with RDFlib in Python

I have an rdf file, for example: …
Marcelo
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How to parse N3 in RDFlib

I am trying to convert a file into XML using the N3 parser in RDFlib but I am not sure if I am doing it right or even if I have the n3 plugin installed. This is what I have so far: import rdflib from rdflib import URIRef, Graph, Namespace from…
Johnnerz
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Python rdflib Not Parsing Creative Commons License Information Correctly

I was using rdflib version 3.2.3 and everything was working fine. After upgrading to 4.0.1 I started getting the error: RDFa parsing Error! 'ascii' codec can't decode byte 0xc3 in position 5454: ordinal not in range(128) I tried various way to…
Alex
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No handlers could be found for logger "rdflib.term"

I am using rdflib-4.0.1 and rdfextras-0.4 in my python modules. I get the following message while loading data into a rdfstore: No handlers could be found for logger "rdflib.term" What is it I am missing??
GJain
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Refering OWL Class In SPARQL Filter Stament

I have developed an ontology which you can access with the link exist in the code below. The code working fine except FILTER section. If I use equal operator in FILTER, it does not return anything. If I use not equal operator (!=), it does not…
alan turing
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Filtering a n3/turtle file with rdflib and sparql queries

I am trying to filter a turtle file using pyrdf with sparql. But I noticed that sparql queries lose information over the context of the elements. I would like then to re-print the result of the query as a turtle file, is it possible to do this…
ashmikuz
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How to check that two RDF graphs have the same content?

I'm writing a C library that parses and serializes domain-specific data as RDF/XML. After I parse a file and write it back out again I'd like to be able to check that the content hasn't changed. I could parse everything again, write it out as…
jefdaj
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Convert anyURI-typed string representations of CURIes to real CURIes or IRIs

I have triples like this, where the object is an anyURI-typed string representation of a CURIe. I would like to construct the triples with the object as a true CURIe or IRI. @prefix source: . @prefix external:…
Mark Miller
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What's the correct way to code a named graphs where the main graphs contains a triple that refers to the main graph and also displays the named graph?

I'm using Python with the help of the rdflib import to convert a knowledge graph that is in rdf format into a named graph format. I also wanted to add a triple where the named graph is claimed to be said by a source that is within the main graph,…
CJ Acosta
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