use of search() for typed elements

[ecamox]

Hi,

I'm trying to use owlready2 from ipython Notebook to manage a simple ontology in OWL/XML I created with protege', following the examples in the documentation (release 0.3), but I cannot get how to use the search() function with the keywords type, subclass_of and is_a.

For example,  let "Onto.Class" be the name of a class in my ontology, as from the output of list(onto.classes()),  the output of the following

onto.search(type = "Onto.Class")
onto.search(type = "Class")
onto.search(type = "*Class")

is always [].

Moreover, I would expect the output of onto.search(type = "*") to be the list of the individuals in my ontology, but I get the individuals plus the properties (objects and data properties).

search() with keyword is_a  behaves exactly the same, with (onto.search(is_a = "*")) returning individuals and properties, while I cannot get any other answer than [] when I use a string different than "*".

search() with keyword subclass_of behaves more or less the same way (no answer than [] when I use a somehow meaningful string, while the output of onto.search(subclass_of = "*") is a mix of subclasses and some classes (the latter, subclasses of Thing). I don't get the rationale because the output doesn't include
all the classes.

Can you please give me some examples on how to use better the search() function?

Thanks a lot for any suggestion.

Kind regards,
-Elena

[ecamox]

Hi!

I found out the "trick".

I don't have to give the class name as a string but the instance.
The answer to onto.search(type = onto.Class)  is exactly the list of individuals of class Class.

Cheers,
-Elena

[Jiba]

Hi,

You get it right, you need to pass the Class object, not its name. I'm adding such an example in the doc.

With "*", it returns any entity that has at least one "is-a" relation, thus you get individual but also classes and properties. This is normal; in some circonstancies it is usefull to search classes and not individuals.

Kind regards,
Jean-Baptiste Lamy
MCF, LIMICS, Université Paris 13

> Hi!
>
> I found out the "trick".
>
> I don't have to give the class name as a string but the instance.
> The answer to onto.search(type = onto.Class)  is exactly the list of
> individuals of class Class.
>
> Cheers,
> -Elena
>
>
>
>
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