Hello

I try to use random numbers from random.org. 

Here my xpath

let $urand := 
function(){doc("https://www.random.org/integers/?num=1&min=0&max=1000000000&col=1&base=10&format=html&rnd=new";)//*:pre/number()
 div 1000000000}

return
for $i in 1 to 10 return
$urand()

Which brings 10 time the same value, however, every run time a different one. 
What is wrong with this code?

Thanks in advance for your valuable input

Yours
Leo

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