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> In Pizza (or Haskell or ocaml or Scala) one would do like this:
>
> Var b = Var();
> Var authors = Var();
> FLOWR(
> For( b, Doc("books.xml").descOrSelf("bib:book"),
> /* for $b in doc("books.xml") // bib:book */
> Let( authors, b.descOrSelf("bib:author") ),
> /* let $authors = b // bib:author */
> _,
> _,
> Return(
> element("result"),
> Sequence( b.child("bib:title"), authors )
> ) /* return <result>{ $b/bib:title, $authors }</result> */
> )
>
But that's not exactly XQuery, is it? It's a new query language of your own
invention. This approach requires a new query language to be designed for
each host language. You haven't started to address the problems, which range
from incompatible syntax for identifiers between the programming language
and the database, to incompatible semantics for operators like "=".
I think this example absolutely demonstrates the difficulties that arise
with database sublanguages, and the reason they became unpopular.
Michael Kay
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