Architecture server for push, pull and notificatin

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server

C#5.0

Hi,

I want to develop a server with these description :
- model described in a XSD file
- Push an object
- Pull the list of objects or the description of an object
- Notification when an object is changed / created / Delete
- JSON, because I like it
- Client Asp.net to monitor the information

I'll have many clients pushing and pulling information from this server. I want to notify them for modifications
Do you have any suggestion for the technical solution (SOAP ? Rest ? WCF ?) ?

Thank you