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optional elements and null  RSS feed

Thomas V�lk
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If a client does not transfer an optional element to the service, the attribute in the corresponding Java object on the service will be set to "null" or the default value.
On the other hand it is possible, that the client transfers the same attribute with the value "null".

In my scenario it is a big difference if the client did not transfer the element or if the client explicitly sets the element to "null"

In both cases the service receives a Java object with the corresponding attribute set to "null".

So how can the service distinguish between these two scenarios?

[ November 10, 2006: Message edited by: Thomas V�lk ]
It is sorta covered in the JavaRanch Style Guide.
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