wolfgang haefelinger wrote:
Hello (again),

sorry, I have to come  back  as  there's  one point which is not
quit clear to me. In this picture

     (encode)                    (decode)
 XML ------->  ASN.1/(DER|C-PER) -------> XML

it is crucial that the input is  exactly the output, ie. there's
a digital signature applied to the XML document.

Am I correct now that I need the help of EXTENDED-XER to be able
to do this?

Correct

> I have the feeling that when using XER, I'm getting
an XML document where  the value contained is semantically equal
but not the XML as such.

You might also want to investigate the canonical variant of XER called CANONICAL-XER or CXER.
--
Olivier DUBUISSON
France Telecom
Recherche & Developpement
R&D/MAPS/AMS - 22307 Lannion Cedex - France
t: +33 2 96 05 38 50 - f: +33 2 96 05 39 45 - http://asn1.elibel.tm.fr/



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