I am working on a software that should convert owl ontologies into other modeling frameworks like dtdl for example. For the owl ontology loading and parsing I use owlready2. But I have currently 2 open questions when working with owlread2 that I need some help on.
1. I need to receive a map of the defined prefixes with the related iris. I cannot find any hint how to do this.
2. I am not able to load imported ontologies that are not dowloadable using their http iris. I checked out some posting in this forum but was not able to resolve my issue.
For the first problem I would like to know how to retrieve the defined prefixes from an ontology that was loaded into owlready2.
For the second question I need more detailed information about ontology loading. From the postings mentioned above I got information that I can download ontologies to local folders and load them from there. So I tried the following.
- I downloaded the imported ontology from the internet and placed it the local folder /my/ontology/folder as production.owl.
- I added the folder to the owlready2 system using onto_path.append("/my/ontology/folder")
- I also placed my primary ontology that I want to convert in this folder since this can not be downloaded too.
loading my primary ontology works fine using the command:
conversion_ontology = get_ontology("
http://my.ontologies.com/plm/production/isa95/1.0/isa95.owl")
but loading the imported ontology fails with the error:
-------------------8<----------------------------------------
Traceback (most recent call last):
File "/home/username/Development/software/.venv/lib/python3.10/site-packages/owlready2/namespace.py", line 960, in load
fileobj = urllib.request.urlopen("%s/" % (url or f)) # Add missing trailing /, e.g. for
https://spec.edmcouncil.org/fibo/ontology/master/latest/BE/LegalEntities/LegalPersons File "/usr/lib/python3.10/urllib/request.py", line 216, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.10/urllib/request.py", line 525, in open
response = meth(req, response)
File "/usr/lib/python3.10/urllib/request.py", line 634, in http_response
response = self.parent.error(
File "/usr/lib/python3.10/urllib/request.py", line 563, in error
return self._call_chain(*args)
File "/usr/lib/python3.10/urllib/request.py", line 496, in _call_chain
result = func(*args)
File "/usr/lib/python3.10/urllib/request.py", line 643, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 308: Permanent Redirect
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/username/Development/software/src/main.py", line 12, in <module>
conversion_ontology.load(only_local=True)
File "/home/username/Development/software/.venv/lib/python3.10/site-packages/owlready2/namespace.py", line 1017, in load
imported_ontologies = [self.world.get_ontology(self._unabbreviate(abbrev_iri)).load() for abbrev_iri in self.world._get_obj_triples_sp_o(self.storid, owl_imports)]
File "/home/username/Development/software/.venv/lib/python3.10/site-packages/owlready2/namespace.py", line 1017, in <listcomp>
imported_ontologies = [self.world.get_ontology(self._unabbreviate(abbrev_iri)).load() for abbrev_iri in self.world._get_obj_triples_sp_o(self.storid, owl_imports)]
File "/home/username/Development/software/.venv/lib/python3.10/site-packages/owlready2/namespace.py", line 962, in load
raise OwlReadyOntologyParsingError("Cannot download '%s/'!" % (url or f))
owlready2.base.OwlReadyOntologyParsingError: Cannot download '
http://my.ontologies.com/plm/foundation/production/0.7/'!
-------------------8<----------------------------------------------------------
The import statement in my primary ontology looks loke this:
<owl:imports rdf:resource="
http://my.ontologies.com/plm/foundation/production/0.7"/>the content of /my/ontology/folder is:
ls -l /my/ontology/folder
-rw-r--r-- 1 kleegrewec kleegrewec 155720 Feb 2 14:23 isa95.owl
-rw-r--r-- 1 kleegrewec kleegrewec 12609 Feb 1 13:06 production.owl
Any help to overcome one or both of the problems is appreciated by me,
best regards, Christian
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