## org.w3c.dom.xpath
Interface XPathNSResolver

public interface XPathNSResolver

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 Summary
`java.lang.String` `lookupNamespaceURI(java.lang.String prefix)` Look up the namespace URI associated to the given namespace prefix.

Method Detail

### lookupNamespaceURI

    public java.lang.String lookupNamespaceURI(java.lang.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.
  Parameters:
    `prefix` - The prefix to look for.
  Returns:
    Returns the associated namespace URI or `null` if none is found.

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