ontop mapping errors

[Agnes Aboagye]

Hi 

I am fairly new to Ontop.

I am trying to map my ontology to a relational database using Ontop virtual knowledge graph protege plugin, the source part which is the SQL query can retrieve the data; however the target RDF triple is giving me errors.  

"the following predicates are not declared in the ontology:-:crop,"

however, the predicate is declared in the ontology.

Could you please let me know what the issue is, am I missing something?

Thank you

[Roman Kontchakov]

Hi Agnes

I cannot be certain without having seen the ontology and the mapping file, but it looks like there's a problem with "ontology prefixes". Open the "Active Ontology" tab and then select "Ontology Prefixes". For some reason, the "htttp://www.semanticweb.org/NutritionalDataOntology" prefix corresponds to "-". What is the full IRI of your "crop" concept? You can see that in the "Entities" tab when the concept is selected.

Best

Roman

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[Agnes Aboagye]

Hi 

 I have used the full IRI and checked the ontology prefixes, I can't see where the "-" is located, I am getting the same error.

I am happy to show you my ontology if that is okay with you. thank you for your help.

Agnes

[Roman Kontchakov]

Hi Agnes

It would be helpful if you could email the ontology.

Best

Roman

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[Roman Kontchakov]

Hi Agnes

The full IRI of your "crop" concept is <http://www.semanticweb.org/NutritionalDataOntology#crop>, with # rather than /. This means that you should replace the / before "crop" in the mapping with #.

To make your life easier, I suggest you also fix the prefixes - "nutrition:" should stand for "http://www.sementicweb.org/NutritionalDataOntology#" (again, note the last character). When this is fixed, you can write nutrition:crop in your mapping (instead of the full IRI). The default prefix (":") should also be fixed by replacing the trailing / with #. When this is done, you'll be able to use :crop in the mapping.

Best

Roman

On Wed, 5 Mar 2025 at 15:55, Agnes Aboagye <aggie.ab...@gmail.com> wrote:

Hi Roman,

 I have sent you the ontology.

Thanks for your help.

Agnes

[Agnes Aboagye]

Dear Roman,

It is working now.

thank you so much

Agnes