75
Collections in XQuery
•Ordered and
unordered collections
–/bib/book/author = an ordered collection
–Distinct(/bib/book/author)
= an unordered collection
•LET $a = /bib/book à $a is a
collection
•$b/author à a collection (several authors...)
RETURN <result> { $b/author } </result>
Returns:
<result>
<author>...</author>
<author>...</author>
<author>...</author>
...
</result>