I’ve got a problem running Q12 from http://www.w3.org/TR/xquery/ # XQuery 1.0: (Q12) List each publisher and the average price of its books. FOR $p IN distinct(document(“bib.xml”)//publisher) LET $a := avg(document(“bib.xml”)//book[publisher = $p]/price) RETURN {$p/text()} {$a}…

avg() problem

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