如何将Java库与XPath命名空间结合使用？

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.14.3</version>
</dependency>

XPath xpath = XPathFactory.newInstance().newXPath();

public class MyNamespaceContext implements NamespaceContext {
    @Override
    public String getNamespaceURI(String prefix) {
        if ("ns".equals(prefix)) {
            return "http://www.example.com/namespace";
        }
        return null;
    }

    @Override
    public String getPrefix(String namespaceURI) {
        if ("http://www.example.com/namespace".equals(namespaceURI)) {
            return "ns";
        }
        return null;
    }

    @Override
    public Iterator<String> getPrefixes(String namespaceURI) {
        List<String> prefixes = new ArrayList<>();
        if ("http://www.example.com/namespace".equals(namespaceURI)) {
            prefixes.add("ns");
        }
        return prefixes.iterator();
    }
}

xpath.setNamespaceContext(new MyNamespaceContext());

String xml = "<root xmlns:ns=\"http://www.example.com/namespace\"><ns:element>Value</ns:element></root>";
InputSource inputSource = new InputSource(new StringReader(xml));
String expression = "//ns:element";
String result = xpath.evaluate(expression, inputSource);
System.out.println(result);