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How do I solve the Reference to undeclared namespace prefix: '%s' problem with Microsoft's msxml implementation? I'm using an XML feed from a government web-site that contains values i need to parse. The xml contains namespaces: <?xml version="1.0" encoding="ISO-8859-1"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:cb="http://www.cbwiki.net/wiki/index.php/Specification_1.1" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3c.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3c.org/1999/02/22-rdf-syntax-ns#rdf.xsd"> <item rdf:about="http://www.bankofcanada.ca/stats/rates_rss/STATIC_IEXE0101.xml"> <cb:statistics> <cb:exchangeRate> <cb:value decimals="4">1.0351</cb:value> <cb:baseCurrency>CAD</cb:baseCurrency> <cb:targetCurrency>USD</cb:targetCurrency> <cb:rateType>Bank of Canada noon rate</cb:rateType> <cb:observationPeriod frequency="daily">2011-05-09T12:15:00-04:00</cb:observationPeriod> </cb:exchangeRate> </cb:statistics> </item> </rdf:RDF> Running the XPath query: /rdf:RDF/item/cb:statistics/cb:exchangeRate/cb:targetCurrency fails with the error: Reference to undeclared namespace prefix: 'rdf' Edit : If i edit the original XML to remove all use of namespaces: <?xml version="1.0" encoding="ISO-8859-1"?> <rdf>

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