Can I use a dynamic text as the name of result node?

[=?GB2312?B?1dTA1w==?=]

Hi,

How to create an xml fragment whose root name is dynamic? The following code
is false, of course.

let $a := <a>bbb</a>
let $r := $a/text()
return
<{$r}>something</{$r}>

With namespace?

return
<{QName("http://aaa",concat($prefix,":",$r))}/>

Are there any methods to do this?

Thanks,
Lei
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