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WCF & optional XmlElements (no datacontract)

I asked a question about deserializing based on an attribute with data contracts. Apparently this isnt possible so I have to convert my DataContract to use XmlElement's (see http://stackoverflow.com/questions/2177079/net-represent-xml-in-class-without-xsd)

I'm assuming datacontracts cannot intermingle with xmlelements. How can I define an optional XmlElement? With a DataContracts DataMember I would just set IsRequired = false, but no such option appears to exist.

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