How to Query Individuals using OWL DL Query in Protege 4?

Question

How do I query individulas in my ontology, here is a description of what I would like to do (similar to SQL queries):

I have three classes (components, features, and polarity). The polarity value can be positive_polarity or negative_polarity, both are subclasses of polarity.

• a_component hasFeature a_Feature
• a_Feautre hasPolarity a_Polarity

I would like to list all components which have a positive_polarity value.

How can this be achieved using the DL Query tab in protege 4?

Answer 1

component that hasFeature some (feature that hasPolarity some negative_polarity)

provided that there's a feature in there somewhere asserted as type:

feature that hasPolarity some negative_polarity