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It is always good to see such things go mainstream. Although it is very handy to post get XML without interrupting the user but I have succesfully implemented XML-RPC in javascript to solve very complex interface issues, maybe not ipossible but not quite elegant otherwise. All were large scale commercial apps and all hit the users at first sight. Data communication without submitting and refreshing. It looked like black magic.
The straight forward nature of calling "functions" and using them over XML-RPC provides a more firm ground and lets the programmer to focus on the job rather than on the limitations of the browser.
There were many javascript XML-RPC implementations out there long before AJAX became the new kid on the block.
Although it is very handy to have XML processing at hand in javascript I just want to point out that this is no silver bullet. It is just an elegant solutions to a known problem. It is not a new solution
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