Importing vocabulary raises "Error: SQLITE_CONSTRAINT: CHECK constraint failed: id != '' AND label != ''"

[mars-f]

I am attempting to import a TTL vocabulary file converted from an RDF file. The file is parsed successfully as N3 by Tropy, but after parsing, before the import completes, Tropy raises the following error:

{"msg":"Failed to import vocabulary.","stack":"Error: SQLITE_CONSTRAINT: CHECK constraint failed: id != '' AND label != ''","system":"Windows_NT 10.0.22621 (x64)","time":1698279332959,"version":"1.15.2"}

Steps to reproduce:

• Import the vocabulary muninn-military-vocabulary-after-edits.ttl.txt

muninn-military-vocabulary-after-edits.ttl.txt is the TTL file I am attempting to import.

Here is the original vocabulary: https://rdf.muninn-project.org/ontologies/military-en.html

muninn-military-vocabulary.ttl.txt is the original converted OWL->TTL file. It was converted with https://www.easyrdf.org/converter. I then edited the converted TTL file to strip the ()+ characters and get it past Tropy's N3 parser.

[inukshuk]

Can you post the N3 file you're trying to import again? The link above doesn't seem to work.

[mars-f]

2nd try:
muninn-military-vocabulary-v2.ttl.txt

[inukshuk]

Thanks and apologies for the cryptic error message!

The issue is that there are 22 empty labels in the file. This is no big deal and we should just ignore blank lables during import instead of raising an error. In the meantime you can work around this by removing all empty ""@de and ""@fr labels. I'm attaching a version of the file here.

muninn-military-vocabulary-v2.n3.txt

[mars-f]

Your workaround worked, and the file was imported. Thank you.

Unfortunately the vocabulary file has further issues: only a fraction of the terms were imported. I'll follow up with a separate bug if I can figure out what the new problem is.