[xmlsec] Signing an XML file.

[Aleksey Sanin]

> The XML file (4uonly.xml):

This is not a signature template file.

http://www.aleksey.com/xmlsec/api/xmlsec-notes-sign-encrypt.html

and especially this

http://www.aleksey.com/xmlsec/api/xmlsec-examples-sign-template-file.html#XMLSEC-EXAMPLE-SIGN1-TMPL

Aleksey