RE: define views using xquery

As a starter from the scientific side you may check out
some recent papers by Serge Abiteboul and others (one of
Serge's favorite themes is views in all disguises).
 
I'd be also be interested in the actual difficulties that you
encountered when trying views with XQuery. In principle
one can regard a view as a "stored" query which can be
composed with other queries. As one of XQuery's virtues
is compositionality, another is closure, so I wonder where exactly
the difficulty lies.
 
(1) Is it the combination of XML-Schema and XQuery that
you (presumably) need.
 
(2) Is it updatability of views that concern you?
 
(3) Is it that your notion of "simple view" doesn't translate
to an XQuery notion of a "simple query"?
 
(4) Which sort of views do you want to define?
 
Have you got any concrete examples, usecases, requirements?
Where exactly do you encounter inefficiency?
 
Best regards,
 
Peter
 
 

-----Original Message-----
From: www-ql-request@w3.org [mailto:www-ql-request@w3.org] On Behalf Of
Chen Ya Bing
Sent: Donnerstag, 21. Februar 2002 10:02
To: www-ql@w3.org
Subject: define views using xquery


I'd like to use XQuery as a view definition language to define XML
views. but I find that it is difficult to use it as the view definition
language, because a simple view definition have to lead to a complex
XQuery. even more, it may be inefficient. comparing with view definition
in SQL, it is inconvenient.
 
can anybody give me advices of how to utilize XQuery to define XML view
more efficiently?
and how will the XQuery WD support the view facility.
 
Best regards,
Chen