[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: XML-enabled databases, XQuery APIs
Good picture :-). Although you can also use indices to find branches inside the trees using XPath/XQuery... Dana Florescu, Don Chamberlin and I have organized a tutorial for SIGMOD later this year that talks about the different ways relational database systems (and the different vendors) are providing XML support (both on the functional level as well as architectural implementation details). It will talk among other things also about what it generally considered shredding and BLOB storage vs different degrees of XML storage fidelities. Note that a node table representation is a shredded storage of XML but provides XML Infoset/Data model fidelity. And it can be implemented efficiently as our implementation shows. Once SIGMOD puts the material online, I will post a link on my weblog. The tutorial follows my book chapter in the "XQuery from the Experts" book (http://www.amazon.com/exec/obidos/ASIN/0321180607/musionxmlxque-20?crea tive=125581&camp=2321&link_code=as1) in case you cannot wait. :-) Best regards Michael (http://sqljunkies.com/weblog/mrys) PS: And no, XML in a relational database is not any more a hack than a so-called native XML database.... > -----Original Message----- > From: Bullard, Claude L (Len) [mailto:len.bullard@i...] > Sent: Friday, April 15, 2005 1:57 PM > To: 'Ronald Bourret' > Cc: xml-dev@l... > Subject: RE: XML-enabled databases, XQuery APIs > > And that makes sense. I have this mental image of a > 2D table pasted to a wall and each cell map to a brick. > If you walk behind the wall, you see little trees growing > behind some of the bricks. > > Use the relational index to find the tree in the > forest. Use XPath or XQuery to walk the tree > fetch a leaf or saw off a branch. > > Thanks Ron. > > len > > > From: Ronald Bourret [mailto:rpbourret@r...] > > Another way to think about all of this is that the XML data type is the > exposed tip of a native XML database embedded inside a relational > database. > > Clear as mud? > > -- Ron > > Bullard, Claude L (Len) wrote: > > > I don't understand this nearly well enough. In a > > relational database, what are the characteristics > > of an "XML type"? > > > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php> > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php>
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