> > From: Neil.Young
> >   
> OK. Thanks Mike, this was a very interesting lesson. But what 
> about the "not cross-domain" claim?

Glad to help. Let's break it down a bit more.

The cross-domain question is really completely separate from the data
format.

The bottom line is:

XMLHttpRequest can *not* be used cross-domain.

Script tags and dynamic script elements *can* be used cross-domain.

You can put any piece of executable JavaScript code in a file, and load and
execute it cross-domain.

A JSON object by itself is not executable JavaScript. It is a valid
JavaScript object, but you need something more to make it directly
executable: perhaps a variable assignment as you used, or a function call.

JSONP is merely a popular convention for turning a JSON object into
executable JavaScript code, by wrapping it in a function call.

-Mike


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