[protobuf] Is possible to create custom serialization with RuntimeTypeModel?

[ET]

Hi, I have problem to serialize object XmlElement.

[DataContract]
class Data
{
     [DataMember(Order = 20)]
     public XmlElement Something { get; set; }
}

This class is not mine, and I can't modify that, but I would like to
serialize it via protobuf. I started with runtime model. Unfortunately
protobuf is not able to work with XmlElement.

In case I can modify this class I would to trick write XmlElement to
string and pass it to protobuf. ( original class has much more member,
so it's worth it)

[ProtoContract]
class Data
{
     public XmlElement Something { get; set; }

     [ProtoMember(20)]
     private string SomethingProto
     { get { return Something.WriteToXmlString(); }
     { set { Something = FromXmlString(value); }
}

Is there possibility to define such conversion/callback on runtime
model? Something like custom serializer for Field.

Thanks,ET

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