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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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Making changes to a ntriples file with python

Scenario: I just got my hands on a huge ntriples file (6.5gb uncompressed). I am trying to open it and perform some operations (such as cleaning some of the data that it contains). Issue: I haven't been able to check the contents of this file.…
DGMS89
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Node-red lost connection to the server with new node

I have to connect to Sparql endpoint and query RDF via Node-red. I found an add-on node called node-red-contrib-sparql which enables that. I am able to install the node. I downloaded python and install required libraries for nodes to work. However,…
Laura
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Querying the shared nodes in a RDF graph

I have a graph of RDF data, that is the result of a SPARQL query in rdflib, but this question is valid just on any endpoint too. The graph looks like the picture below. I want to find a way to query the nodes that are shared between two clusters.…
PitPartizan
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install 'rdflib' on online jupterlab over browser

I'm new to jupyterlab, I run it on my browser. While I'm adding Sparql code, I tried to import rdflib; However, it shows me an error saying ModuleNotFoundError: No module named 'rdflib'. I need help of how to make rdflib works on online JupyterLab
Medhat Ahmed
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Searching an xml file with rdflib and sparql

I'm struggling to understand how sparkle query's work. I have a following xml…
Ninjasoup
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Owlready2 parsing error when calling sync_reasoner

The ontology was created using protege and populated data from database using the owlready2 library. Now this line is giving this error: sync_reasoner(my_world) This is the error I have encountered: Could not parse ontology. Either a suitable…
Tharindu
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Ontology: Create class connections in an ontology

I have an ontology (a taxonomy, with classes only; no individuals) like this: Owl:Thing Parts Jackfruit Jackfruit_flower Grape Plant Jackfruit_tree Grapevine I want to create a relation to connect…
OntoUser
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How to get graph's namespaces in rdflib

I've loaded an RDF file in Python, using rdflib: g = rdflib.Graph() g.parse ( "foaf_ex.rdf" ) the *.rdf defines a number of prefix/namespace pairs (e.g., foaf:) and I know they come into g because they're still there when I print g.serialize(). My…
zakmck
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SPARQL Query to Identify Predicates from One of Many Graphs

I have created an ontology by grouping together many ontologies. I want to use SPARQL to identify all middle terms (relationships) from one ontology from the group ontology. The following approach only produces a pyparsing error. g =…
mac389
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RDFlib query not working

I wrote a Python script that should be able to run through a list of dbpedia URI's and run a query on them. However, for some reason I get an error on qres = g.query(query) when I run this code. Does anyone know why this happens and how I could…
Knarf
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Query regarding SPARQL with a RDF file using CIDOC-CRM ontology

I'm a beginner in Apache Spark, SPARQL, I'm trying to make some queries on an RDF file using CIDOC-CRM ontology, I execute this SPARQL query but It never turn with a result from rdflib import Graph g = Graph() g.parse("data.rdf") res = g.query( …
Yardi
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Error parsing N-Triple file using RDFlib

I am trying the load the triples from a Linked data dump into my local triplestore using RDFlib. An example triple in my file: "Some detail about the subject"@EN . Snippet of the code: …
RDangol
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RDFlib count not working in SPARQL query

I am exploring python based library 'RDFlib' with native store (Sleepycat). A basic "select * ..." query works fine but COUNT does not seem to work. Here is my code: from rdflib import ConjunctiveGraph, Namespace, Literal path =…
RDangol
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Parsing SPARQL UPDATE queries with rdflib

I am trying to programmatically analyze a SPARQL 1.1 UPDATE query using rdflib. Using the following (Python 3.5) code: from rdflib.plugins.sparql.parser import parseUpdate from pprint import pprint qs = '''DELETE { <> a ,…
user3758232
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Failure adding graph to remote SPARQL store

I am trying to add triples to a remote SPARQL repository, using Python and rdflib 4.2.2. Adding statement-wise works: gsu = rdflib.plugins.stores.sparqlstore.SPARQLUpdateStore(sparql_endpoint, update_endpoint, bNodeAsURI=False, sparql11=True,…
Jay
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