The XPathNSResolver interface permits prefix strings in an XPath expression to be properly bound to namespace URI strings.
The XPathEvaluator interface can construct an implementation of XPathNSResolver from a node, or the interface may be implemented by any application.
XPathNSResolver.lookupNamespaceURI()Looks up the namespace URI associated to the given namespace prefix.
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https://developer.mozilla.org/en-US/docs/Web/API/XPathNSResolver