Learning XQuery

bookload.xqy

let $books := 
  <bookstore>
    <book category="COOKING">
      <title lang="en">Everyday Italian</title>
      <author>Giada De Laurentiis</author>
      <year>2005</year>
      <price>30.00</price>
    </book>
    ... other books from W3Schools example ...
  </bookstore>

return
  xdmp:document-insert("books.xml", $books)

collapse.txt

("a", "b", "c, "d")
("a", (), "b", "c", "d")
("a", ( "b", "c"), "d")

literal.txt

1                 (: a sequence of 1 xs:integer literal :)
"Hello World"     (: a sequence of 1 xs:string literal :)

squares.xqy

(: returns a sequence of perfect squares :)
for $i in (1 to 10)
return
  $i * $i

squares2.xqy

(: IF statement inside FLWOR statements :)
for $x in (1 to 10)
return
  if($x ne 2) then
    $x * $x
  else
    "the number of years I have loved XQuery"

statements.txt

(: Some of the locations in FWLOR that could be considered sequences :)
for $x in SEQUENCE
let $y := SEQUENCE
return
  SEQUENCE

(: Sequences inside IF/ELSEs :)
if( BooleanExpression ) then
  SEQUENCE
else
  SEQUENCE

two.xqy

(: Two statements expressed as a sequence :)
(
  for $book in fn:doc("books.xml")//book
  return
    fn:concat( $book/title, ": ", $book/author), 

  if(fn:exists(//book[fn:contains(./title, "SQL")]) then
    "Yuck"
  else
    "Hooray!"
)