SPARQL in Protege 4.3

Question

I need to return individuals for my query:

SELECT ?subject ?class
            WHERE { ?subject rdfs:subClassOf ?class. 
?class rdfs:comment "linear"@en}

But it works only with subclasses. Should I replace rdfs:subClassOf on different operator?

Answer 1

Your query specifically asks for ?subjects that are subclasses of ?class (where ?class has the rdfs:comment "linear"@en). To retrieve instances of type ?class, you'd use

?subject rdf:type ?class

or, since SPARQL allows abbreviating rdf:type by a,

?subject a ?class

Answer 2

If you can't share details about the body of data, you are querying, you might want to get an idea yourself by checking

SELECT ?s ?p ?subject ?class
WHERE
{ ?s ?p ?class . 
  ?subject rdfs:subClassOf ?class . 
  ?class rdfs:comment "linear"@en .
} ORDER BY ?s ?p ?subject ?class

and/or

SELECT ?subject ?class ?p ?o
WHERE
{ ?subject ?p ?o .
  ?subject rdfs:subClassOf ?class . 
  ?class rdfs:comment "linear"@en .
} ORDER BY ?subject ?class ?p ?o

from where you can expand in the same manner until you get a handle.