Adding Prefixes to SPARQL query helper causes "does not look like a valid URI, trying to serialize this will break"

[Superraptor]

This isn't a huge issue, just more annoying with large datasets, but essentially, SPARQL queries work regardless of whether prefixes are defined in them or not.

However, with prefixes, I always get a warning that is PREFIX wd: <https://wikiname.wikibase.cloud/entity/> PREFIX wdt: <https://wikiname.wikibase.cloud/prop/direct/> SELECT ?p ?o WHERE { <https://wikiname.wikibase.cloud/entity/Q4087> ?p ?o } does not look like a valid URI, trying to serialize this will break.. Since I'm running thousands of queries though-- this pops up a lot.

Is there either (a) a way to stop this warning or solve whatever serialization error is occurring (either by declaring prefixes in a different place or changing the query, or (b) a way to silence or suppress these warnings if (a) isn't possible?

Thanks so much!

[LeMyst]

Hello @Superraptor , I don't understand your issue, maybe there is a missing part, do you have a code example to share?
If you don't use prefix, you don't need to declare them.
I can't reproduce your issue on Wikidata Query Service, maybe some of your elements have data issue, that would explain why you don't have the issue everytime? https://w.wiki/Agye

[Superraptor]

@LeMyst thanks for responding!

So I'm basically running this:

queryPrefixes = "PREFIX wd: <"+namespaces['wb']+"> PREFIX wdt: <"+namespaces['p']+"> "

queryResult1 = sparqlQuery(queryPrefixes+"SELECT ?p ?o WHERE { <"+resp["s"]["value"]+"> ?p ?o }", wbi_config) # This resolves to, for example: PREFIX wd: <https://wikiname.wikibase.cloud/entity/> PREFIX wdt: <https://wikiname.wikibase.cloud/prop/direct/> SELECT ?p ?o WHERE { <https://wikiname.wikibase.cloud/entity/Q4087> ?p ?o }

def sparqlQuery(query, wbi_config):
    responseJSON = wbi_helpers.execute_sparql_query(query, None, wbi_config['SPARQL_ENDPOINT_URL'], None, 10, 1)
    return responseJSON

Each time this runs, it works, but it prints this to console:

PREFIX wd: <https://wikiname.wikibase.cloud/entity/> PREFIX wdt: <https://wikiname.wikibase.cloud/prop/direct/> SELECT ?p ?o WHERE { <https://wikiname.wikibase.cloud/entity/Q4087> ?p ?o }  does not look like a valid URI, trying to serialize this will break.

If I run this:

queryResult1 = "SELECT ?p ?o WHERE { <"+resp["s"]["value"]+"> ?p ?o }", wbi_config) # This resolves to, for example: SELECT ?p ?o WHERE { <https://wikiname.wikibase.cloud/entity/Q4087> ?p ?o }

def sparqlQuery(query, wbi_config):
    responseJSON = wbi_helpers.execute_sparql_query(query, None, wbi_config['SPARQL_ENDPOINT_URL'], None, 10, 1)
    return responseJSON

It works and does not print anything to console.

This would be fine, but I do have some queries where the prefixes have to be declared. And when you're running 10,000+ queries, having a warning print to console 10,000+ times really clutters things.

[LeMyst]

I'm not sure what in WikibaseIntegrator can create this behavior.
You can try again with more logs by adding theses lines:

import logging
logging.basicConfig(level=logging.DEBUG)

I don't think this will help at all, but, for your information, execute_sparql_query accept a "prefix" parameter where you can add your prefixes (but in the end, it only concatenate the prefix and your query)

[dpriskorn]

"does not look like a valid URI" did not return any results in the repo. This is propagated from somewhere else...
Here is the culprit:
https://github.com/RDFLib/rdflib/blob/ccb9c4a56e6bfcf1474480552e62a21461b85239/rdflib/term.py#L276
But rdflib is not used in WBI so I suggest closing this as invalid because it is not WBI related.

[LeMyst]

Like @dpriskorn , without any more informations, it's difficult to solve the issue.