/usr/local/lib/swipl/library/ext/ssl/xmldsig.pl
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 xmld_signed_DOM(+DOM, -SignedDOM, +Options) is det
Translate an XML DOM structure in a signed version. Options:
key_file(+File)
File holding the private key needed to sign
key_password(+Password)
String holding the password to op the private key.

The SignedDOM must be emitted using xml_write/3 or xml_write_canonical/3. If xml_write/3 is used, the option layout(false) is needed to avoid changing the layout of the SignedInfo element and the signed DOM, which will cause the signature to be invalid.