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Quantified expressions

XQuery allows quantified expressions, which decide properties for all elements in a list:

The following example finds the titles of all books which mention both sailing and windsurfing in the same paragraph: 

for $b in document("bib.xml")//book
where some $p in $b//paragraph satisfies
  (contains($p,"sailing") AND contains($p,"windsurfing"))
return $b/title

The next example finds the titles of all books which mention sailing in every paragraph: 

for $b in document("bib.xml")//book
where every $p in $b//paragraph satisfies
  contains($p,"sailing")
return $b/title

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