I want to design a dynamic questionnaire system using the XML as the questions resource.
After I load the questions in the XML,how can I display them and let the users to select and submit the answers ?
This appears to be a Flex question. Please try the Flex forums here http://forums.adobe.com/community/flex/flex_general_discussion
Have a look a BRiffle, by Flexriver. http://www.flexriver.com/spip.php?rubrique41
If I remember right, it has an XML option a bit the way you describe it.
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