Query with distinct

For each author in the bibliography, list the author's name and the titles of all books by that author, grouped inside a result element.

   for $a in distinct-values(document("bib.xml")//author)
     { $a }
     {  for $b in document("bib.xml")/bib/book[author=$a]
        return $b/title

Adapted from XML Query Use Cases

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Copyright 2002, 2003 Elliotte Rusty Harold
Last Modified February 4, 2002