The mangling I see is removing the DOCTYPE, or removing the PUBLIC identifier from the DOCTYPE. I think you can turn off loading of the DTD. This may make XML::Twig not change the prolog. You can also access the doctype with doctype() and set it with set_doctype().

In reply to Re: XML::Twig Mangles XML prolog by iburrell
in thread XML::Twig Mangles XML prolog by gjeffrey

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