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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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Python and rdflib: parsing issues

I am using rdflib (package python-rdflib 2.4.2-3, Python 2.7.5+, Ubuntu 13.10) with immense frustration. I am simply trying to load two NT files into a local triple store. This is the code: from rdflib import Graph graph = Graph('Sleepycat') rt =…
Mulone
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Changing the join order in a custom RDFLib store

In a project we override the store triples method to generate virtual triples given a subject/predicate or predicate/object pair. And the logic depends on either the subject or object being bound to a real value to work. We are receiving federated…
Jerven
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retrieving object based on its URI using RDFAlchemy and rdflib

I am using RDFAlchemy and rdflib graph for the source of the data, i.e. rdfalchemy.rdfSubject.db. How can I have rdfalchemy map an object if I have its uri? calling the constructor with the uri creates an object but doesn't retrieve values of other…
fadmaa
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Querying local SPARQL endpoint is very slow

I have setup a local SPARQL endpoint with DBPedia database using Openlink Virtuoso through this guide. Then I tried to query my database through Python with the help of RDFLib and SPARQLWrapper. Problem is the time it take for a query (through…
hainam
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How to authenticate to Wikimedia Commons Query Service using OAuth in Python?

I am trying to use the Wikimedia Commons Query Service[1] programmatically using Python, but am having trouble authenticating via OAuth 1. Below is a self contained Python example which does not work as expected. The expected behaviour is that a…
Frankie Robertson
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python: parse owl file in manchester syntax to owlready

Is it possible to parse an ontology given in manchester syntax such that it ends up as an owlready ontology-object. This is what I found out so far: Owlready itself can only import "NTriples, RDF/XML or OWL/XML format" (ref1). Ontospy can (among…
cknoll
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Python / rdflib HTTP server for sparql endpoint

Is there a capability for or example of creating a Sparql HTTP endpoint with rdflib? We would want it to follow the spec and be able to return json and/or csv formats. This would mostly be for POC usage. It would also be possible to use…
CCVirginia
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import namespace from ".owl" file and use terms in RDFLIB graph

I am creating a graph using rdflib. I want to use some terms from a ".owl" file I have. How can I import this owl file as MyImportedTerminology with rdflib, and access its terms, so that I can do something like this in the graph? g.add((Thing,…
abra
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Printing/Parsing JSON object from RDF query result

I'm trying to parse a result from an SPARQL query from Sesame. I found sample code, the relevant part below, and I'm showing my result below. (response, content) = httplib2.Http().request(endpoint, 'POST', urllib.urlencode(params),…
NealWalters
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How to convert Pandas DataFrame to RDF (Resource Description Framework)?

I'm looking for a recipe for converting Pandas DataFrames to RDF data in Python. I'm aware of the following Python modules (I know how to Google!), but they do not work for me: rdfpandas pandasrdf Neither seems mature. I have problems with both. In…
Dr. Andrew John Lowe
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SPARQLWrapper QueryBadFormed error for long SELECT query

Is there a limit on the size of the query you can use with with a SELECT query? I have a long SELECT query (posted below) that keeps throwing a QueryBadFormed error. I have validated the query on sparql.org and I have ran the query on the triple…
Bill
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printing out individuals for each concept in an ontology using rdflib

I have and ontology written in OWL/RDF(using Protege). This ontology has been already populated with some individuals for each concept. I have ported it in to python using rdflib and FuXi packages. And I can successfully parse my Ontology and put in…
Hossein
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SPARQL query performance with rdflib-sqlalchemy

I have 7200 or so SKOS.Concept objects created by rdflib-sqlalchemy from parsing a turtle file stored in a Postgres DB. The following SPARQL query takes over 30 seconds to respond with data: SELECT ?subject ?prefLabel WHERE { ?subject rdf:type …
fiacre
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What does the "identifier" in "Graph" do?

I try to query a database like this: from rdflib import Graph, Literal, URIRef from rdflib.namespace import RDF, SKOS from rdflib.plugins.stores import sparqlstore # define endpoint according to https://www.stardog.com/docs/ endpoint =…
Cleb
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Python: how to add information from Dbpedia to my graph using rdflib?

I am creating an ontology and I want to add data from dbpedia. For instance, I want to add data regarding Switzerland. This is what I am doing. g = Graph() sparql = SPARQLWrapper("http://dbpedia.org/sparql") query = """ PREFIX dbo: …
emax
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