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Ever wondered how would flex keep track for elements added to arraycollection? And I'm sure you know about dynamic keyword and that Object class is already dynamic and that the syntax you've just used to construct a JSON object is an example of building dynamic objects.
with this background, mx_internal_uid is flex's way to tell one object from another while for example searching for some object in the array collection.
wan to get rid of it? take a look at IUID interface.
hope this helps.
Thanks for the reply, I think I understand why Flex is using the uid to keep track of the information. You have lost me a bit with the dynamic keywords as I have only been programming for about a week so still allot to learn! I think I perhaps ask my question wrongly, what I really want to know is, am I sending multiple arrays correctly using JSON is there another way? Thanks again for your reply.
I don't see any problem with the way you're pushing multiple arrays into JSON and hoping that you're actually them right on the server side.