RE: IfExpr has a mandatory else clause

Jimmy

Feel free to download XStreamDB, a native XML database, from
www.bluestream.com.  The reference manual describes our current support for
Update, although we are currently working on an improved syntax.

cheers
Jim

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On Behalf Of
> Jimmy Zhang
> Sent: Friday, January 30, 2004 1:14 AM
> To: [email protected]
> Subject: Re: IfExpr has a mandatory else clause
>
>
>
> 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
>
>
>
>