W3C home > Mailing lists > Public > public-lod@w3.org > March 2009

Re: Finding SPAQL endpoints?

From: Giovanni Tummarello <g.tummarello@gmail.com>
Date: Mon, 9 Mar 2009 23:44:52 +0000
Message-ID: <210271540903091644q57eeb560s33b24798de682686@mail.gmail.com>
To: Daniel Schwabe <dschwabe@inf.puc-rio.br>
Cc: public-lod@w3.org
I know what's missing :-): any a real application that need to do the
automatic discovery etc and that someone would really want to use, i.e. not
another academic demonstrator.

If there was one such application people would put in the last 10 minutes of
work.

People do at this point go to the extent of publishing RDF data becouse
there is this mailing list where you can post about it and being read so the
incentive is that you hope someone is going to do something with it.

Which in fairness is perfectly fair :-).. and in fact when one such
application pops up it will find a good number of people with the technology
and know how to put more data online

Giovanni



> So something is still missing. Either each dataspace mantainer that is
> willing to provide the SPARQL endpoint also provides a (even if minimal)
> sitemap.xml or voiD description, or at least follows this convention.
> This would greatly enhance the accessibility of the data, and enable tools
> to automatically find them as needed...
>
> Cheers
> D
>
>
> Sergio Fernández wrote:
>
> On Sat, 2009-03-07 at 00:36 -0300, Daniel Schwabe wrote:
>
>
>  I could query the site for its sitemap extension (would it always be
> <home url>/sitemap.xml?
>
>
>  Yes, you can do it in a programmatic way. But that URL (/sitemap.xml),
> even it's common used, it's not mandatory, so you can't use it as a
> constant. But there is one way, not so direct, but at least one that is
> standard:
>
> 1) From /robots.txt you can take the Sitemap's URL ("Sitemap:" as [1]
> specifies)
> 2) According the extension proposed by DERI [2], you can check if the
> sitemap points a SPARQL enpoint looking for the
> sc:sparqlEndpointLocation element.
>
> Hope that helps.
>
> Best,
>
> [1] http://www.sitemaps.org/protocol.php
> [2] http://sw.deri.org/2007/07/sitemapextension/
>
>
> --
>   Daniel Schwabe
> Tel:+55-21-3527 1500 r. 4356
> Fax: +55-21-3527 1530
> http://www.inf.puc-rio.br/~dschwabe<http://www.inf.puc-rio.br/%7Edschwabe> Dept.
> de Informatica, PUC-Rio
> R. M. de S. Vicente, 225
> Rio de Janeiro, RJ 22453-900, Brasil
>
Received on Monday, 9 March 2009 23:45:32 UTC

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