actionscript 3 - Save new data to pre-existing XML file -

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i want make quiz game as3. have made database questions , answers, looks this:

<quiz>     <question>question 1</question>     <answers>         <answer>answer a</answer>         <answer>answer b</answer>         <answer>answer c</answer>     </answers> </quiz>

but want able add new questions via as3. how can add new question , have saved permanently database - such can access new questions later on? beginner, appreciate if keep answer simple. database xml file put on disk instead of server.


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