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RE: XML and Queries (not XQL)
- From: Michael Rys <mrys@m...>
- To: "'Jonathan.Robie@S...'" <Jonathan.Robie@S...>,sellberg@k..., xml-dev@l...
- Date: Thu, 22 Feb 2001 09:57:22 -0800
Title: RE: XML and Queries (not XQL)
I would like to
disagree with Jonathan here. There are approaches to use (annotated) schemata
(not necessarily DTDs) to define XML views over relational datat that then can
be queried using an XML query language. XPath against annotated schemata in
SQLServer 2000 is one example.
Also, please note
that the use case R1 is representing only one potential serialization/view of
relational data (and not my preferred one, I may add).
However, using
the schema language alone to perform queries becomes pretty unwieldy. One of the
best ways that utilize DataGuides (instance-inferred schema) for a visual query
interface see Lore (the queries were translated into Lorel, Lore's query
language).
Best
regards
Michael
Selberg wrote:
> Are there examples of using XML as a substitute for
> an SQL query? I mean examples of using a DTD to
define
> a valid search given as XML as the search
criteria in
> a database?
I have seen several approaches to this. None of them seemed
all that useful.
> Is it a good idea to make an abstraction of a
> valid database entity in a DTD and make an abstraction
of
> a valid search criteria in a DTD? I have
searched for such
> examples and I couldn't find
any. Maybe the lack of such
> examples is telling
me that it is not a way to go. XQL
> is not what we
need.
The XML Query Working Group's use cases include "Use Case R"
[1], which performs queries on an XML view of a relational database. The use
case assumes these views are created automatically.
Jonathan
[1] Use Case R (http://www.w3.org/TR/xmlquery-use-cases#rdb)
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