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public interface: XPathNSResolver [javadoc | source] The XPathNSResolver interface permit prefix strings in the expression to be properly bound to namespaceURI strings. XPathEvaluator can construct an implementation of XPathNSResolver from a node, or the interface may be implemented by any application.

See also the Document Object Model (DOM) Level 3 XPath Specification.
Method from org.w3c.dom.xpath.XPathNSResolver Summary:
Method from org.w3c.dom.xpath.XPathNSResolver Detail:
 public String lookupNamespaceURI(String prefix)
    Look up the namespace URI associated to the given namespace prefix. The XPath evaluator must never call this with a null or empty argument, because the result of doing this is undefined.