SELECT ?x ?y
WHERE (?x <http://a.com/ontology#hasChild> ?y)

SELECT ?x ?y
WHERE (?x f:hasChild ?y)
USING f FOR <http://a.com/ontology#>

SELECT ?x ?y
WHERE (?x <http://www.w3.org/2000/01/rdf-schema#subClassOf> ?y)

SELECT ?x 
WHERE (?x rdf:type fam:Woman)
USING 
fam FOR http://a.com/ontology#


SELECT ?x 
WHERE (fam:MARY rdf:type ?x)
USING 
fam FOR http://a.com/ontology#

SELECT ?x 
WHERE (fam:F rdf:type ?x)
USING 
fam FOR <http://a.com/ontology#>     
(owl:class)

SELECT ?x 
WHERE (fam:hasChild rdf:type ?x)
USING 
fam FOR <http://a.com/ontology#>        

(owl:ObjectProperty)


SELECT ?x 
WHERE (?x rdfs:subClassOf fam:F)
USING 
fam FOR <http://a.com/ontology#>

SELECT ?x 
WHERE (?x rdfs:subClassOf fam:Person)
USING 
fam FOR <http://a.com/ontology#>