Q62

Consider the following XML DTD describing course information in a university: <!ELEMENT Univ (Course+, Prof+)> <!ELEMENT Course (Title, Eval*)> <!ATTLIST Course Number ID #REQUIRED Instructor IDREF #IMPLIED> <!ELEMENT Title (#PCDATA)> <!ELEMENT Eval (#PCDATA)> <!ATTLIST Eval Score CDATA #REQUIRED> <!ELEMENT Prof EMPTY> <!ATTLIST Prof Name ID #REQUIRED Teaches IDREF #IMPLIED> What is returned by the following XQuery? let $as := / /@Score for $c in /Univ/Course[Eval] let $cs :=$c/Eval?@Score where min($cs) > avg($as) return $c