resolver permits translation ofprefixes within the XPath expression into appropriate namespace URIs . If this is specified as null, any namespace prefix within the expression will result in DOMException being thrown with the code NAMESPACE_ERR.
@return The compiled form of the XPath expression.
@exception XPathException INVALID_EXPRESSION_ERR: Raised if the expression is not legal according to the rules of the XPathEvaluatori
@exception DOMException NAMESPACE_ERR: Raised if the expression contains namespace prefixes which cannot be resolved by the specified XPathNSResolver.
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