[xsd-users] How can I put the attribute xsi:type="DataDocument" in the root node?

[Boris Kolpackov]

Hi Roberto,

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Roberto Escobar <rescobar at datatec-ec.com> writes:

> auto_ptr<Document> doc(FpML("xml_swap.xml"));
> 
>  
> Document document(*doc);
>
> [...] 
>
> Now,  as I need to manipulate the object "DataDocument" instead
> "Document", I do the cast, but this return null.

Making a copy of a polymorphic object model is a bad idea. What
happens here is you "slice" the object and loose all the dynamic
type information. Instead you should always use references (and
_clone() of you really need to make a copy):

Document& document (*doc);
 

> Since I had this problem then I created new functions, which I will
> return the DataDocument instead Document based on FpML functions. These
> functions work well. But in the header would have to be "xsi: type =
> DataDocument", but not shown this, it is because I am showing the Object
> DataDocument, so my question is whether it is possible to put this
> attribute in the header.

You should use the FpML() functions for serialization. If your
document is not "sliced", you should get the xsi:type attribute
automatically.

Boris