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Re: XQuery & Several records (instead of one xml-field)

  • From: Jim Melton <jim.melton@a...>
  • To: "Mukul Gandhi" <gandhi.mukul@g...>
  • Date: Thu, 18 Oct 2007 08:42:05 -0600

Re:  XQuery & Several records (instead of one xml-field)
Mukul,

In addition to the sources already cited, I should mention part 14 of 
the SQL standard (ISO/IEC 9075-14:2006, called SQL/XML, new edition 
expected in mid-2008), that defines a new datatype, XML, for use as 
the type of SQL columns, parameters, variables, etc (collectively 
"sites").  XML values stored in sites of type XML are manipulated 
primarily by invoking XQuery from within SQL statements.

SQL/XML provides default rules for "viewing" relational tables as 
though they were XML documents, as well as facilities that allow 
application writers to customize the XML structures created from 
those relational tables.

SQL/XML is "fully" implemented by Oracle (full disclosure: I work for 
Oracle), IBM, Microsoft, HiRDB (Hitachi), and others.  I put the word 
"fully" in quotes because none of those products implement every 
single tiny little option in the SQL/XML standard.  They all do, to 
my knowledge, implement "core SQL/XML" and quite a few of the 
optional features.  Speaking only from the Oracle viewpoint, we have 
scads (that's an Americanism meaning "a whole lot") of customers 
using our SQL/XML features and managing their XML data directly in 
their SQL database systems.

By the way, the first version of SQL/XML was published in 2003, four 
years ago, and products that implemented it hit the street less than 
a year later.  (That first version did not have the ability to invoke 
XQuery from within SQL, largely because XQuery wasn't near enough to 
publication as a Recommendation at that time.)

Hope this helps,
    Jim


At 10/18/2007 07:26 AM, Mukul Gandhi wrote:
>Do these products construct from scratch the XQuery data model
>instance, from a RDBMS Schema ?
>
>I have read that some latest RDBMSs provide a native XML store, which
>can be queried with XQuery. Something like XML type support in table
>columns.
>
>On 10/18/07, Michael Kay <mike@s...> wrote:
> > > Some people said me, that extraction of _records from several
> > > database tables_ into XML is possible by XQuery. I searched
> > > via google during last two week, read many documents about
> > > XQuery and related topics, but found only usage of XQuery for
> > > extraction XML-elements from XML-field, i.e. from _one field_.
> >
> > Sounds as if you didn't find DataDirect's product
> >
> > http://www.datadirect.com/products/xquery/index.ssp
> >
> > I think BEA Liquid Data also has such facilities.
> >
> > Michael Kay
> > http://www.saxonica.com/
>
>
>--
>Regards,
>Mukul Gandhi
>
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========================================================================
Jim Melton --- Editor of ISO/IEC 9075-* (SQL)     Phone: +1.801.942.0144
   Co-Chair, W3C XML Query WG; XQX (etc.) editor    Fax : +1.801.942.3345
Oracle Corporation        Oracle Email: jim dot melton at oracle dot com
1930 Viscounti Drive      Standards email: jim dot melton at acm dot org
Sandy, UT 84093-1063 USA          Personal email: jim at melton dot name
========================================================================
=  Facts are facts.   But any opinions expressed are the opinions      =
=  only of myself and may or may not reflect the opinions of anybody   =
=  else with whom I may or may not have discussed the issues at hand.  =
======================================================================== 



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