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Add HTML Snippet solely on particular pages

I want to add a HTML Snippet on particular pages (not world). That is the snippet:

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:dio="http://docs.dionera.com/namespace/DioML">

Can somebody give me a touch, methods to clear up that? For the time being I take advantage of a plugin (insert headers & footers)…however the plugin hundreds the snippet on every web page and never on particular pages.

Thanks very a lot!

P.S. I haven’t got a lot expertise in instances like that – sorry.