Error on updating an import

[Thomas Francart]

Hello

I have a project that imports another, through "Metadata > Namespaces and Imports > Import > Add import from Local Project".

I want to update the import, hence I choose "Update data from linked project" to the right of the import. I get a cryptic error message : "Could not delete ontology import, because that operation would produce graphs only kept live by staged graphs". I don't understand what the message means or what is possibly wrong with my setup.

What does this mean ?

FYI none of the 2 projects is using validation or history. Both are OWL projects. The imported one is local, the importing one is remote on GraphDB.

Thanks

Thomas

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Thomas Francart - SPARNA
linked data | domain ontologies | knowledge graphs
blog : blog.sparna.fr, site : sparna.fr, linkedin : fr.linkedin.com/in/thomasfrancart
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[Thomas Francart]

Also, I have a more detailed error when trying to **delete** the import:

Could not delete ontology import, because that operation would produce graphs only kept live by staged graphs

Details:

it.uniroma2.art.semanticturkey.ontology.OntologyManagerException: Could not delete ontology import, because that operation would produce graphs only kept live by staged graphs at it.uniroma2.art.semanticturkey.ontology.impl.OntologyManagerImpl.computeOntologyRemoveCascade(OntologyManagerImpl.java:1127) at it.uniroma2.art.semanticturkey.ontology.impl.OntologyManagerImpl.removeOntologyImport(OntologyManagerImpl.java:1020) at it.uniroma2.art.semanticturkey.ontology.impl.OntologyManagerImpl.removeOntologyImport(OntologyManagerImpl.java:995)

at it.uniroma2.art.semanticturkey.services.core.Metadata.removeImport(Metadata.java:430)

Note : the project I am importing itself contains an owl:imports to the SKOS ontology. Could that create some kind of side effect ?

Thomas

[Thomas Francart]

Answering my own question : Indeed, I can confirm that the error disappears if I remove the SKOS import from the imported project.

It is often the case that I work with OWL ontologies that import SKOS to use SKOS properties to label and define classes and properties, and to define equivalent classes on skos:inScheme values.

I am reluctant to remove these import declarations to please VB. To which extent could VocBench work with ontologies that import SKOS ?

Thanks !

[Roland Wingerter]

Dear Thomas,

this is unfortunate, but there is a workaround.

1. Use SPARQL to drop the graph you want to update, e.g.
DROP GRAPH <yourgraphuri>.
2. Go to 'Namespaces and Imports' and remove the graph name by clicking on the trash can next to it.

3. Add import from "Local File"

Kind regards

Roland

[Roland Wingerter]

Dear Thomas,

Thanks for pointing it out. A bug report has been filed on this issue.

Regards

Roland

[Manuel Fiorelli]

Dear Roland and Thomas,

we made several bug fixes to the import from local projects since VocBench 13.0: now your bug should be addressed.

Best regards,

Manuel

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