std.xml2 (collecting features) control character

[Adam D. Ruppe via Digitalmars-d]

On Thursday, 18 February 2016 at 15:56:58 UTC, Robert burner 
Schadek wrote:
> When trying to validate/convert an utf string these lead to 
> exceptions, because they are not valid utf character.

That means the user didn't encode them properly...

Which one specifically are you thinking of? I'm pretty sure all 
those control characters have a spot in the Unicode space and can 
be properly encoded as UTF-8 (though I think even if they are 
properly encoded, some of them are illegal in XML anyway).

If they appear in another form, it is invalid and/or needs a 
charset conversion, which should be specified in the XML document 
itself.