Query with Booleans

• XQuery booleans include:

  • and

  • or

  • not()

• List books published by Addison-Wesley before 1993:

  <bib>
   {
     for $book in doc("bib.xml")/bib/book
     where $book/publisher = "Addison-Wesley" and $book/@year < 1993
     return
        $book/title 
   }
  </bib>
  

• Do you notice anything funny about this query?

Adapted from XML Query Use Cases