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I mentioned case-folding mainly for two reasons:
1 - By default PHP's xml_parse() XML_OPTION_CASE_FOLDING option is enabled.
(please see http://php.linux.pt/manual/en/ref.xml.php#xml.case-folding)
2 - By default XML_Transformer's caseFolding option is disabled.
XML is case sensitive, and XML_Transformer tries to respect it. The 'problem' is in PHP's XML parsing support.
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