Getting the document type from an element

[David Garcia <da...@partners.netfocus.es>]

Hi,
 
We're trying to validate XML digital signatures enveloped in another
transport documents, as depicted below
 
<Transport>
 
            <Invoice>
                        <NodeToBeSigned/>
            .
            <ds:Signature>
                        <ds:Reference="#NodeToBeSigned".>
 
</ds:Signature>
 
            </Invoice>
 
</Transport>
 
 
Normally, the construction of the whole message is as follows, the
data-to-be-signed (Invoice) is created and then signed (ds:Signature).
The references (#NodeToBeSigned) of the signature are relative to the
Invoice. After that, the invoice is slipped inside a transport document
suitable for these purposes.
 
When receiving the signature, we must invert the construction steps,
thus considering only the invoice (effectively detaching the invoice
from the transport document). In that process, we're getting some
problems when studying the following strategies
 
Option A ) XMLObject.copy() over the invoice: This option creates a
document-fragment, so the XML processor fails, because it's expecting a
full Invoice element. To get there, we're considering to get the
document for the Invoice, but we don't know how to do this (specially in
the cases where the Invoice schema is not known to XMLBeans and should
be treated as an AnyType.
 
 
Option B) XMLObject.save() (and alter that reparsing, less efficient),
but when trying this option, the signature gets broken because the
namespaces from the parent nodes (transport) are also included on the
invoice node. Using the saveImplicitNamespaces() option works, but this
can fail because we don't know which of these namespaces are declared in
the parent and which ones are declared in the invoice and in the
ds:Signature.
 
Any hints or guidelines would be greatly appreciated,
 
Thanks in advance,
 
Best regards,
 
Dave Garcia