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

Re: Converting a variety of data formats, containingvarious ki

  • From: "Norman Gray" <norman@astro.gla.ac.uk>
  • To: "Liam R. E. Quin" <liam@w3.org>
  • Date: Wed, 05 Oct 2016 18:17:26 +0100

Re:  Converting a variety of data formats
Liam, hello.

On 5 Oct 2016, at 18:01, Liam R. E. Quin wrote:

It turns out even RDF has moved away from triples - an RDF "named
graph" associates (implicitly) additional information with each triple.

For example, consider needing to track the date on which each fact was
entered into a database. If you store that as a separate triple (on
such-and-such a date triple-id foo was added by bar (oops that's four))
you need to record when that information was added and by whom.
I think that might be an exaggeration. Some _implementations_ of triple stores might usefully store such extended provenance information, in the same way that some XML parsers or databases might document that they preserve attribute order. That doesn't meant that 'XML has moved away from unordered attributes'.

'Named graphs' are different. There, there's a mild extension (formally standardised, I _think_) of the RDF model, to include the name of the graph in which the statement 'Alice knows Bob' is asserted. Such graphs are supported in 'quad stores'. Such provenance turns out to be rather painful to express in bare RDF, to the extent that the extension is often useful.

All the best,

Norman


--
Norman Gray : https://nxg.me.uk
SUPA School of Physics and Astronomy, University of Glasgow, UK


[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]


PURCHASE STYLUS STUDIO ONLINE TODAY!

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.
Email
First Name
Last Name
Company
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.