Greger,

It's a good question. You can pass Custom objects to and from Web Services.
In your case , the Person Object, should have Public Properties to depitct
the details of the Person Object

As long as the properties of the Person object are a primitive types, you
don't have to bother too much. Look at the sample below ...

Public Class Person
    Public Property PersonId as Integer
   Public Property PersonName as String
End Class

If atleast one of the Property of the Person object is a CusomCollection,
you need to consider lot of things before passing objects to and from web
services.
The following scenario has address collection inside Person Object

Public Class Person
    Public Property PersonId as Integer
    Public Property PersonName as String
   Public  Propery PersonAddress as AddressCollection
End Class

In such case the Custom Collections are not transmitted directly between web
services and clients. Meaning Custom Collections are passed as Array of
Objecs.
If if it is passed as Array of Objects, you loose tight coupling between
Person Object and AddressCollection property. In this scenario you really
need to figure out a way to maintain the tight coupling between Person Object
and AddressCollection Propery.
         The way to do is to enable tight coupling with PersonId. Meaning
have a defintion for PersonId in the AddressCollection.

Please let me know if this reply is useful. If you need more information let
me know.
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Thanks & Regards,
Sundar Narasimman