Just in case people missed the mailing list post:
My student Xugang Song (Song) has just demoed to me Turtle-star -> RDFLib Graph -> Turtle-star deserialisation, serialisation roundtrip, for all of the approved Turtle-star test cases [1]. His work is buried deep in the repo at [2].
We are considering what he might do with his remaining student time (2 months) but, whatever else he does, he will contribute his final work as a neat PR to RDFLib.
If you have a strong request for what he might do - perhaps other format conversions or benchmarking of RDFLib's implementation v. others - please le me know on this mailing list ASAP.
Regards, Nick
[1] https://w3c.github.io/rdf-tests/turtle/
[2] https://github.com/RDFLib/rdflib-rdfstar/
I don't like our chances of implementing deterministic BN hashes in the sort term: this is a hard problem.
There is a W3C WG convening now (https://www.w3.org/groups/wg/rch) that aims to solver the larger problem that is predicated on solving this one:
"There are a variety of use cases that depend on the ability to calculate a unique and deterministic hash value of RDF Datasets...These use cases require a standard way to process the underlying graphs contained in RDF Datasets that is independent of the serialization itself. "
I have a turtle file with id's (not URI's).
When I parse it with rdflib, it adds a "file:///home/user/path/to/ttl_file/" prefix, which I don't want.
I can change the prexfix with the publicID parameter, but I can't get rid of it.
Is there a way to achive this behavior?
1 reply
Input file (with only ids):
@prefix xsd: http://www.w3.org/2001/XMLSchema# .
<D00002> <isOriginalData> true .
<hsa:10> <isOriginalData> true ;
<interaction> <D00002>,
<D00448> .
<hsa:111> <isOriginalData> true ;
<interaction> <D00002> .
#
Serialised file AFTER parsing (with prefix added):
@prefix ns1: file:///home/user/data_folder/ .
@prefix xsd: http://www.w3.org/2001/XMLSchema# .
<hsa:10> ns1:isOriginalData true ;
ns1:interaction ns1:D00002,
ns1:D00448 .
<hsa:111> ns1:isOriginalData true ;
ns1:interaction ns1:D00002 .
ns1:D00002 ns1:isOriginalData true .
base - as illustrated in the W3 Turtle doc intro: https://www.w3.org/TR/turtle/#sec-intro
data in attachment and hsa is missing a prefix declaration)
But i also need to query the knowledge graph, and this results into a id with prefix.
"hsa:111" is unfortunately an id, "hsa:" is not a prefix.
1 reply
rule1.set_as_rule("""Patient(?p), hasSymptom(?p,couch) -> hasDisease(?p,الربو)""")) in Python It gives me this error......(raise LexingError('Lexing error near "%s..."!' % self.s[self.idx : self.idx + 15], self.idx)
owlready2.rply.LexingError: ('Lexing error near "الربو)..."!', 51)
3 replies
Hi, is rdflib graph object same as rdfjs graph object?
No, how could it be? RDFLib - Python - is a Python dictionary-based object, the JS one uses JS data structures.
Or can some one please send an example of how rdflib graph object looks like?
A stringified example of graph object if possible. Thanks
You can print a Python object's properties like this:
from rdflib import Graph
g = Graph()
print(dir(g))
But to really understand RDFLib's Graph object, I suggest you just read the documentation, perhaps here: https://rdflib.readthedocs.io/en/stable/utilities.html
graph = default_world.as_rdflib_graph()
list( graph.query_owlready( """ PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX my: <http://www.semanticweb.org/allaithgroup/ontologies/2021/11/untitled-ontology-33#>
SELECT ?x ?y ?z
WHERE { ?x my:hasDiagnosis ?y .
?y rdfs:comment ?z }