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From Sergey Beryozkin <>
Subject Re: How to hand polymorphic entities in JSON without namespaces?
Date Thu, 14 Feb 2013 15:45:13 GMT
On 14/02/13 14:55, James Talbut wrote:
> Hi,
> I have a base class ("ExtensionArgumentType") which has ~12 different sub classes derived
from it.
> The classes themselves are all defined in an XSD and are primarily used in SOAP.
> When I try to communicate with the server using WebClient I get something like:
> 		"ExtensionArgument" : [{
> 				"@xsi.type" : "ns2:ParameterValueType",
> 				"ns2.Name" : "ScalarParameter",
> 				"ns2.Value" : "Value1"
> 			}, {
> 				"@xsi.type" : "ns2:ParameterValueType",
> 				"ns2.Name" : "ScalarComboParameter",
> 				"ns2.Value" : "Value2"
> 			}
> I don't mind having the "@xsi.type" parameter there, and I'm happy to write whatever
would be useful in it, but:
> 1. There is no ns1 anywhere in the HTTP request from WebClient, so how do I know which
prefix to use?
> 2. I don't want to have prefixes on the other elements (Name&  Value).
> If I tell the client to ignore namespaces it won't write the xsi.type at all.
> If I introduce a namespace map and give it an entry from my namespace to nothing it removes
the namespace from Name/Value, but leaves ns2 on the type name.
> If I introduce a namespace map and give it an entry from my namespaec to something that
prefix is used for Name, Value&  type.
> Is there any way to get what I'm after?
Passing this with JSON is tricky, and the immediate workaround I can 
think of is to get the receiving end to map "ns2" to a specific 
namespace (with namespace map), but in your case I guess there could be 
up to 12 namespaces...

I can think of a workaround where JSONProvider which sends the data is 
configured (via transformation properties) to structure the payload such 
that it has enough hints for the receiving JSONProvider to convert the 
incoming payload (also with transformation properties) for JAXB to map 
it correctly

I wonder if should enhance StaxTransformFeature to change prefixes when 
needed for every specific subtype you'd be able to use a 
dedicated prefix and thus manage the namespace map on the receiving end 

Cheers, Sergey

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