Thanks for answering.
I found your explanations and suggestions of links interesting and encouraging.
In any case, I did not clarify my question. I would like to know how to create any property without even knowing its name. I read several documents and manuals until I understood. Hope this helps.
var data:XML = <node/>; var $my_attr:String = 'id'; data.@ [$my_attr] = 'foo';
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