Working with SOSA ONTOLOGY, problem with namespaces

[aicarrera]

Hi, I am not experienced working with ontologies, I am trying to follow the tutorial from the book (Ontologies with Python)  to populate an ontologies with a csv  and it works with the example in the book, but then I tried to populate SOSA ontology (https://www.w3.org/ns/sosa/) I transformed it to rdf/xml and this one class I populated



This is the code. I am using the namespace to access properties


the saved individuals look like this:
 

The problem is that when I tried to show the information of the properties using other example of the book, it just shows an empty list even when I see that the information is there.  
I think is because of the namespaces, but I have no idea how to fixit, I´ve tried to use the namespace but I got an error


how it shows


I think when I saved the individuals no longer uses the whole uri, just the abreviature, I don't know if has something to do with that.

Please help :(

[Jiba]

Hi,

The ontology population seems ok, the problem is probably in the dynamic website code.

Could you send me that code and the ontology (or a small part of it), so I can try to debug the problem?

Jiba

[aicarrera]

Hi! Thank u so much for your reply

This is the link of the code in python:

https://drive.google.com/file/d/1FFBkQr2bdQxJ2cJ4t0QCIpGqk-Vkjh48/view?usp=sharing

This is the link of the ontology (The individuals are at the end):

https://drive.google.com/file/d/1ALDOZQ5-hE_Z5GQrEk1svLEdqcZqh0Wm/view?usp=sharing

The whole project is in here:
https://drive.google.com/drive/folders/1XuzssOPH-1RvZfaZSjTncaTMrxDdZ4jm?usp=sharing

Thanks again

[Jiba]

Hi,

I think there is a problem in the ontology:
 * The ontology IRI is "http://www.w3.org/ns/sosa" (abbreviated sosa:)

 * Entities are defined with just their name, e.g. "<owl:Class rdf:about="Observation">". The resulting IRI is obtained by combining the ontology IRI with the name, leading to "http://www.w3.org/ns/Observation" (notice the absence of "/sosa" in the IRI, caused by the absence of a / to separate the ontology IRI and the name)

 * Entities are then referred as e.g. sosa:Observation, corresponding to the IRI "http://www.w3.org/ns/sosa/Observation", which is NOT the IRI that was used to define them. Consequently, the class, properties, etc are not well referenced. If you open you ontology in Protégé, you will see 2 distinct Observation classes.

In such circumstances, you should use full IRI when defining entities, e.g. "<owl:Class rdf:about="http://www.w3.org/ns/sosa/Observation">". Protégé does that.

BTW, there is also another mistake in sensor_showOG.py: in ontology_page(), "return html" should not be inside the loop.

Jiba