Return Attribute as Element

[tovo]

Hi,
how can I return an Attribut as an element?
The document looks like that:
book

if hab a query like

for $i in input()/book
return {$i/@isbn ???}{$i/title}

Thanks

tovo

[Curtis_Pew]

for $i in input()/book
return {string($i/@isbn)}{$i/title}