How can you control .NET DataContract serialization so it uses XML attributes instead of elements?

If I have a class marked as a DataContract and a few properties on it marked with DataMember attributes I can serialize it out to XML easily, but it would create output like:

<Person>
    <Name>John Smith</Name>
    <Email>john.smith@acme.com</Email>
    <Phone>123-123-1234</Phone>
</Person>

What I would prefer is attributes, like...

<Person Name="John Smith" Email="john.smith@acme.com" Phone="123-123-1234" />

The DataMember attribute allows me to control the Name and Order but not whether it is serialized as an element or attribute. I have looked around and found DataContractFormat and IXmlSerializable but I am hoping there is there an easier solution.

What is the easiest way to do this?