Problem with simple queries : search

[AdelHans]

Hello,
I am trying to find the sub classes of a given class with owlready2 but I am having an issue with ontologies like pizza and go . this is my code and what I get when I run it:
----------------------------------------------------------
onto_path = "D:\Projects\SPARQL Translator\Ontologies\pizza.owl"
onto = get_ontology(onto_path).load()
print( onto.base_iri)
for i in onto.search(subclass_of=onto.NamedPizza):
    print( i.iri)
----------------------------------------------------------
Traceback (most recent call last):
  File "D:/Projects/SPARQL Translator/Entity Mapping.py", line 7, in <module>
    for i in onto.search(subclass_of=onto.NamedPizza):
  File "C:\Users\Adel\AppData\Local\Programs\Python\Python38-32\lib\site-packages\owlready2\namespace.py", line 349, in search
    else:                                   v2 = v.storid
AttributeError: 'NoneType' object has no attribute 'storid'
http://www.co-ode.org/ontologies/pizza/
------------------------------------------------------------
Best Regards
Adel Hansali

[Mike Bergman]

I think you can use this Owlready2 method:

print(onto.NamedPizza.descendants())

Best, Mike

On 4/30/2020 11:08 AM, AdelHans [via Owlready] wrote:

Hello,
I am trying to find the sub classes of a given class with owlready2 but I am having an issue with ontologies like pizza and go . this is my code and what I get when I run it:
----------------------------------------------------------
onto_path = "D:\Projects\SPARQL Translator\Ontologies\pizza.owl"
onto = get_ontology(onto_path).load()
print( onto.base_iri)
for i in onto.search(subclass_of=onto.NamedPizza):
    print( i.iri)
----------------------------------------------------------
Traceback (most recent call last):
  File "D:/Projects/SPARQL Translator/Entity Mapping.py", line 7, in <module>
    for i in onto.search(subclass_of=onto.NamedPizza):
  File "C:\Users\Adel\AppData\Local\Programs\Python\Python38-32\lib\site-packages\owlready2\namespace.py", line 349, in search
    else:                                   v2 = v.storid
AttributeError: 'NoneType' object has no attribute 'storid'
http://www.co-ode.org/ontologies/pizza/
------------------------------------------------------------
Best Regards
Adel Hansali

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[AdelHans]

Same problem
I think the problem is related to the namespace
Thank you

[Jiba]

Hi,

There are several version of the pizza ontology, some define the classes in the ontology namespace and other don't.

Please try :

    print(onto.NamedPizza)

If it is None, then the NamedPizza is defined in another namespace.

For example, if you use this pizza ontology :

    https://raw.githubusercontent.com/owlcs/pizza-ontology/master/pizza.owl

The full name of NamedPizza is "http://www.co-ode.org/ontologies/pizza/pizza.owl#NamedPizza" while the ontology is named "http://www.co-ode.org/ontologies/pizza". so the ".owl" is missing.

You can use a namespace as follows to solve this problem:


onto = get_ontology("pizza.owl").load()

namespace = get_namespace("http://www.co-ode.org/ontologies/pizza/pizza.owl#")
print(namespace.NamedPizza)
print(default_world.search(subclass_of = namespace.NamedPizza))


Jiba