I'm looking for more info on what the data in the extension data field should look like. Iv'e seen the example:
<ExtensionData>
<Customer>
<WeddingDate>10/11/2012</WeddingDate>
<Allergies>Wheat</Allergies>
</Customer>
</ExtensionData>
but I've seen seemingly more simple ones too. What is necessary, and why do some like the one above look hierarcle.