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I don't want to be one of those that gives meaningless advise but I'm keen to 'give back' to this forum so here goes ... maybe completely up the wrong tree ...

I'll assume you're generating the XDP on a server and then passing that to the browser as a content type "application/vnd.adobe.xdp+xml"

Have you also tried setting the character set to UTF-8 ?  I use ASP and have "response.CharSet = "utf-8" " in my header.