How to query data from a object URI in sparql - sparql

Question

<?xml version="1.0"?>
<rdf:RDF xmlns="http://localhost/mydata#"
xml:base="http://localhost/mydata"
xmlns:g="http://localhost/mydata/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<owl:Ontology rdf:about="http://localhost/mydata">
<owl:imports rdf:resource="http://www.owl-ontologies.com/travel.owl"/>
<owl:imports rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#"/>
</owl:Ontology>
</rdf:RDF>
I have my RDF in the above format. I wish to query the data in the resource http://www.owl-ontologies.com/travel.owl as well. How can I do it? I get the URI value using the below query but shall be done next?
prefix ab:<http://www.owl-ontologies.com/travel.owl#>
prefix rdfs:<https://www.w3.org/2000/01/rdf-schema#>
prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix owl:<http://www.w3.org/2002/07/owl#>
SELECT ?y
WHERE { ?x owl:imports ?y.
?
}