Re: IfExpr has a mandatory else clause

You may be interested in trying the latest version of Galax, which has
some support for XML updates integrated with XQuery.
That is currently a main-memory only implementation, but you may still
find it interesting.

For more information about Galax:
http://db.bell-labs.com/galax

For more information about XML updates in Galax:
http://www.cise.ufl.edu/research/mobility

Best,
- Jerome

On Fri, 2004-01-30 at 04:14, Jimmy Zhang wrote:
> Hello,
> 
>   I am really interested in the update, modify and delete aspect of XQuery.
> Could someone
> provide some pointers as to how existing products implement those features.
> 
>   My questions (which I am looking for some kind of references):
> 
>   (1) Assuming XQuery is built directly on top of native XML datatype,
> instead of DBMS form of storage,
> how do update, modify and delete of individual data fields impact the
> performance of database?
> 
>   (2) Do any Xquery implementations offer features that allow one to
> extract/remove an element in its serialized format?
> 
>   (3) Do any Xquery implementations allow one to splice together new XML
> document from multiple other documents? Or the reverse of it, which allows
> one to quickly take apart a big XMLdoc into multiple smaller ones?
> 
>   (4) Would features in 1~3 be useful now? What about in the future?
> 
>  Thanks,
> Jimmy
> 
> 
>