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 > >_______________________________________________________________________ > >XML-DEV is a publicly archived, unmoderated list hosted by OASIS >to support XML implementation and development. To minimize >spam in the archives, you must subscribe before posting. > >[Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ >Or unsubscribe: xml-dev-unsubscribe@l... >subscribe: xml-dev-subscribe@l... >List archive: http://lists.xml.org/archives/xml-dev/ >List Guidelines: http://www.oasis-open.org/maillists/guidelines.php ======================================================================== 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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