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The documentation now explicitly explains that the XML declaration is not a processing instruction according to the XML 1.0 Specification and the W3C DOM Level 1/2 Core specifications. It advises against using createProcessingInstruction() to insert an XML declaration and recommends QXmlStreamWriter. This clarification aims to reduce confusion caused by the similar syntax of processing instructions and the XML declaration. Fixes: QTBUG-21166 Pick-to: 6.9 6.8 6.5 Change-Id: I630e0e73bc8e4b6f145cb1e771a0a6fec54543cf Reviewed-by: Safiyyah Moosa <safiyyah.moosa@qt.io> Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>