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Re: SPARLQ endpoint discovery

From: Richard Cyganiak <richard@cyganiak.de>
Date: Mon, 4 Apr 2011 13:51:02 +0530
Cc: Giovanni Tummarello <giovanni.tummarello@deri.org>, Francisco Javier López Pellicer <fjlopez@unizar.es>, semantic-web <semantic-web@w3c.org>
Message-Id: <E4C6B6AF-6DD6-4C34-A263-5B8A0E7D2565@cyganiak.de>
To: Martin Hepp <martin.hepp@ebusiness-unibw.org>
Hi Martin,

On 4 Apr 2011, at 13:44, Martin Hepp wrote:
> Since Semantic Sitemaps don't validate in Google tools, it is hard to convince site-owners to use them.
> 
> However, there is a work-around: You can publish BOTH a regular sitemap and a semantic sitemap for your site and list both in the robots.txt file.
> 
> Google should accept the regular one (you could also submit this to them manually) and ignore the semantic sitemap. RDF-aware crawlers would find both and could prefer the semantic sitemap.

Yes, this works AFAIK. But this style of using Semantic Sitemaps loses their main advantage: being a simple extension of an established format that many webmasters already use.

Best,
Richard




> 
> The downside of this approach is that you risk to increase the crawling load on your site. But I would assume you could minimize the overlap of URIs in both - e.g., you do not need to tell Google of your compressed RDF dump file resources.
> 
> Best wishes
> 
> Martin
> 
> On Apr 4, 2011, at 8:53 AM, Richard Cyganiak wrote:
> 
>> Hi Giovanni,
>> 
>> Semanitc Sitemaps seemed like a good idea because it was a very simple extension to standard XML Sitemaps, which are a widely adopted format supported by Google and other major search engines.
>> 
>> What killed Semantic Sitemaps for me is the fact that adding *any* extension element, even a single line, makes Google reject the Sitemap.
>> 
>> In practice, XML Sitemaps are not an extensible format.
>> 
>> On the question of complexity of Sitemaps and VoID: Publishers will get it right if and only if there is a) some serious consumption of the data that publishers actually care about and b) a validator. At the moment neither a) nor b) is given, neither for Semantic Sitemaps nor for VoID.
>> 
>> Best,
>> Richard
>> 
>> 
>> On 3 Apr 2011, at 18:16, Giovanni Tummarello wrote:
>> 
>>> With the Sitemap extension called Semantic Web Sitemap we did indeed
>>> give a very simple alternative.
>>> It was also partially adopted
>>> 
>>> http://www.arnetminer.org/viewpub.do?pid=190125
>>> 
>>> but what breaks it for that protocol is the part about explaining (to
>>> a machine) how to go from a dump  to "linked data publishing" which is
>>> a very fuzzy concent as fuzzy as "describe"
>>> 
>>> the chances of someone getting that file actually right were slim to
>>> begin with (we had to correct several times those who tried) and as
>>> far as my reports go the chances of getting void right
>>> (which is in RDF therefore much less intuitive for human editing than
>>> a simple XML like sitemaps) cant get much better.
>>> 
>>> i personally think a single line in the sitemap.xml file is really
>>> what'sneeded so wrt this this part of the extention really does its
>>> job. however until there is someone seriously consuming this there
>>> wont be a need to standardize.
>>> 
>>> Gio
>>> 
>>> 
>>> 
>>> 
>>> On Sun, Apr 3, 2011 at 11:06 AM, Francisco Javier López Pellicer
>>> <fjlopez@unizar.es> wrote:
>>>> 
>>>>> 
>>>>> A related question is SPARQL endpoint fingerprinting... Which
>>>>> is not necessarily straightforward as often people put them
>>>>> behind HTTP reverse proxies that stomp on identifiable
>>>>> headers... In principle it would be interesting to do a
>>>>> survey to see the relative prevalence of different SPARQL
>>>>> implementations.
>>>> 
>>>> Agree.
>>>> 
>>>> SPARQL endpoint discovery and SPARQL endpoints fingerprinting could be two
>>>> research lines related with the architecture of SemWeb:
>>>> 
>>>> - Indexing SPARQL enpoint (with/without the help of vocabularies such as
>>>> void) -> A hint for knowing the effective size of the SemWeb initiatives
>>>> 
>>>> - SPARQL endpoint fingerprint identification -> "Market share" analysis of
>>>> SPARQL technology pervalence
>>>> 
>>>> -- fjlopez
>>>> 
>>>> 
>>> 
>> 
>> 
> 
Received on Monday, 4 April 2011 08:21:48 GMT

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