[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

XML query language

  • From: "Oren Ben-Kiki" <oren@c...>
  • To: "XML List" <xml-dev@i...>
  • Date: Tue, 30 Mar 1999 18:41:17 +0200

how to build query language
Paul Prescod <paul@p...> wrote:

>Oren Ben-Kiki wrote:
>> I fail to see the benfit in inventing a new format for query results.
>It isn't about a format. Query languages do not typically work on formats.
>They have an input data model (i.e. a relational data base) and they have
>an output model (i.e. a set of records). An XML Query Language should also
>work in terms of the XML data model (the information set).


>Let's put it this way: you are saying that the query engine should build a
>list of pointers, build a tree, generate XPointer attributes just so that
>an application can get back the original list of pointers!

I don't follow. You yourself have said:

>The IDL for an XML QL should be something like:
>NodeList XMLQuery( DOC doc, String query )

Well, them, what other way is to return a list of XPointers then to store
each in an "element"? This is assuming that you prefer the query engine to
return a list of pointers as a result, which I don't. The one nice thing
about this scheme is that you can add extra data per XPointer - a relevancy
score, for example.

I did mistakenly say:
>> AFAIK all XML QL proposals produce XML as output.
>No, XQL goes out of its way to NOT require that the output be XML. "The
>specification does not indicate the output format. The result of a query
>could be a node, a list of nodes, an XML document, an array, or some other
>structure. That is, XQL does not dictate the binary format of the returns,
>but rather the logical returns." The same is true of XSL patterns.

I stand corrected. I think you've phrased it perfectly above - the output
should be defined in the terms of the XML data model.

Have fun,

    Oren Ben-Kiki

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To (un)subscribe, mailto:majordomo@i... the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@i... the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@i...)


Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.

Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.