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FOR $p IN document("bib.xml")//publisher LET $b := document("bib.xml”)//book[publisher = $p] WHERE count($b) > 100 RETURN $p

FOR generates an ordered list of bindings of publisher names to $p

LET associates to each binding a further binding of the list of book elements with that publisher to $b

at this stage, we have an ordered list of tuples of bindings: ($p,$b)

WHERE filters that list to retain only the desired tuples

RETURN constructs for each tuple a resulting value