Using two ontologies and two mappings

[Martin Just]

Hello everyone.

Is it possible to use two ontologies with two corresponding mapping files?
If not: What would be the best way to still be able to use entities from both ontologies without merging their ontology files?

kind regards

Martin

[Benjamin Cogrel]

Hi Martin,

For the ontologies, you can create a third ontology file that imports the two ontologies, and then provide a XML catalog file telling how to get these files.

For a concrete example, see https://github.com/ontopic-vkg/destination-tutorial/blob/master/vkg/dest-solution.ttl and https://github.com/ontopic-vkg/destination-tutorial/blob/master/vkg/catalog-v001.xml .

For what regards the mapping files, at the moment there is no alternative to merging them. This can be done easily by converting them first into R2RML (if they are not already) and then merge them using the riot from Jena. In a project, we used the following Docker image for Jena: https://github.com/stain/jena-docker

Then the command was something like :

docker jena riot --formatted=TURTLE ./mapping1.ttl ./mapping2.ttl > ./merged-mapping.ttl

Best,

Benjamin

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