What is the equavilent of ServiceContract(FormatMode ...) in Beta 2?

In beta 1, ServiceContract attribute had a parameter called FormatMode which we can use to specify a different formatter. The parameter is gone in Beta 2. Does any one know how should I specify that I want to use XmlSerilizer instead of XmlFormatter in beta 2? Thanks.
[268 byte] By [hyan] at [2008-3-6]
# 1
[ServiceContract]
[XmlSerializerFormat()]
interface IMyContract
{
...
}
ChristianWeyer at 2007-9-8 > top of Msdn Tech,Visual Studio Orcas,Windows Communication Foundation (Indigo)...

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