ElementTree를 사용하여 Python에서 여러 네임스페이스가 있는 XML을 효과적으로 구문 분석하는 방법은 무엇입니까?

<rdf:RDF xml:base="http://dbpedia.org/ontology/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:owl="http://www.w3.org/2002/07/owl#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
    xmlns="http://dbpedia.org/ontology/">

    <owl:Class rdf:about="http://dbpedia.org/ontology/BasketballLeague">
        <rdfs:label xml:lang="en">basketball league</rdfs:label>
        <rdfs:comment xml:lang="en">
          a group of sports teams that compete against each other
          in Basketball
        </rdfs:comment>
    </owl:Class>
</rdf:RDF>

SyntaxError: prefix 'owl' not found in prefix map

namespaces = {'owl': 'http://www.w3.org/2002/07/owl#'} # add more as needed

tree = ET.parse("filename")
root = tree.getroot()
root.findall('owl:Class', namespaces)