- From: Frans Knibbe <frans.knibbe@geodan.nl>
- Date: Fri, 22 Jul 2011 12:16:13 +0200
- To: public-lod@w3.org
Hello Michael, On 2011-07-22 10:59, Michael Hausenblas wrote: > > Frans, > >> I had a quick look. But I could not find it. I had a closer look now >> and I see the URI probably is http://dbpedia.org/void/Dataset. I have >> tried it. Redirection to either HTML or RDF seems to be in place. >> HTML request lead to http://dbpedia.org/void/page/Dataset, which >> shows a table of VoID properties. The RDF redirection (to >> http://dbpedia.org/void/data/Dataset.rdf) does not seem to work, I >> get an error. > > Sorry, you lost me here. Did you curl it or how did you get your > findings? Yes, I tried curl. I have just tried it again: curl -H "Accept: application/rdf+xml" http://dbpedia.org/void/data/Dataset.rdf The response seems to be different from yesterday. Yesterday I immediately got an error message. I am afraid I don't have the exact message any more. The response I get now is different, a transaction time out, which I get after waiting a bit. Probably this is just a temporary situation and besides the point too. > >> Apart from the error, somehow this is not what I expected. I assumed >> that the dataset URI is the URI of a dataset. It is the key to all >> other data. If you want something from a dataset, you only need to >> know this URI. So why is the dataset URI hard to find? Why isn't it >> used when references are made to DBpedia? Why isn't it the same as >> the base URI (http://dbpedia.org)?. > > <http://lod-cloud.net/dbpedia> a void:Dataset; > foaf:homepage <http://dbpedia.org/>; > > Says everything, or? Well, let me see... First of all, please know that I am new to Linked Data and RDF, so there is a chance I don't fully understand everything. I think what it says is that there is a thing identified by the URI http://lod-cloud.net/dbpedia, that that thing is a dataset and that its home page is http://dbpedia.org/. So, does this mean that the URI of the dataset (DBPedia) is http://lod-cloud.net/dbpedia?? Sorry if I seem to be stupid, it is not my intention. > >> Probably VoID metadata/dataset URIs will be easier to discover once >> the /.well-known/void trick (described in paragraph 7.2 of the W3C >> VoID document) is widely adopted. > > Agreed. But it's not a 'trick'. It's called a standard. Sorry about that! Regards, Frans > > Cheers, > Michael > -- > Dr. Michael Hausenblas, Research Fellow > LiDRC - Linked Data Research Centre > DERI - Digital Enterprise Research Institute > NUIG - National University of Ireland, Galway > Ireland, Europe > Tel. +353 91 495730 > http://linkeddata.deri.ie/ > http://sw-app.org/about.html > > On 22 Jul 2011, at 09:42, Frans Knibbe wrote: > >> On 2011-07-21 16:27, Michael Hausenblas wrote: >>> >>> >>>> But is this really common practice nowadays? Take DBpedia for >>>> example. What is the URI of the DBpedia dataset? Is it >>>> http://dbpedia.org? That does not seem to resolve to a set of >>>> metadata. >>> >>> Did you have a look at the URI I gave you? I mean >>> http://lod-cloud.net/void.ttl >> I had a quick look. But I could not find it. I had a closer look now >> and I see the URI probably is http://dbpedia.org/void/Dataset. I have >> tried it. Redirection to either HTML or RDF seems to be in place. >> HTML request lead to http://dbpedia.org/void/page/Dataset, which >> shows a table of VoID properties. The RDF redirection (to >> http://dbpedia.org/void/data/Dataset.rdf) does not seem to work, I >> get an error. >> >> Apart from the error, somehow this is not what I expected. I assumed >> that the dataset URI is the URI of a dataset. It is the key to all >> other data. If you want something from a dataset, you only need to >> know this URI. So why is the dataset URI hard to find? Why isn't it >> used when references are made to DBpedia? Why isn't it the same as >> the base URI (http://dbpedia.org)?. >> >> Probably VoID metadata/dataset URIs will be easier to discover once >> the /.well-known/void trick (described in paragraph 7.2 of the W3C >> VoID document) is widely adopted. >> >>> >>> BTW, some 30% [1] of the LOD cloud datasets are using VoID ... >>> >>>> Is there a general way of obtaining datasets URIs? >>> >>> Not to my knowledge. We're working on it in LATC [2] - Keith? >>> >>> Cheers, >>> Michael >>> >>> [1] >>> http://www4.wiwiss.fu-berlin.de/lodcloud/state/#data-set-level-metadata >>> [2] http://latc-project.eu/ >>> >>> -- >>> Dr. Michael Hausenblas, Research Fellow >>> LiDRC - Linked Data Research Centre >>> DERI - Digital Enterprise Research Institute >>> NUIG - National University of Ireland, Galway >>> Ireland, Europe >>> Tel. +353 91 495730 >>> http://linkeddata.deri.ie/ >>> http://sw-app.org/about.html >>> >>> On 21 Jul 2011, at 15:19, Frans Knibbe wrote: >>> >>>> >>>> Thanks for the replies. It seems that there is agreement that a >>>> dataset should have a URI and that dereferencing that URI should >>>> return metadata about the dataset. That is good to know. >>>> >>>> But is this really common practice nowadays? Take DBpedia for >>>> example. What is the URI of the DBpedia dataset? Is it >>>> http://dbpedia.org? That does not seem to resolve to a set of >>>> metadata. >>>> >>>> Is there a general way of obtaining datasets URIs? >>>> >>>> I can imagine an RDF dataset comprising all known dataset URIs. And >>>> of course that dataset will have a URI itself. Does such a dataset >>>> exist at the moment? >>>> >>>> Regards, >>>> Frans >>>> >>>> >>>> On 2011-07-21 12:35, Frans Knibbe wrote: >>>>> >>>>> Hello, >>>>> >>>>> I have just placed a Linked Data dataset online and now I am >>>>> struggling with finding the best way to publish the metadata of >>>>> the dataset. I wonder if there are best practices for referencing >>>>> a dataset and its metadata, and for linking the two. >>>>> >>>>> I did find out that using the Vocabulary of Interlinked Data >>>>> (VoID) is a good way to publish the metadata of a dataset. But I >>>>> still need some guidance. I have come up with three questions: >>>>> >>>>> 1) Is it common practice/recommendable to regard a dataset a >>>>> resource? If it is, then all datasets should have a URI, right? >>>>> 2) If having a dataset URI is a good thing, what should be behind >>>>> the URI? Should dereferencing the URI lead to the dataset metadata >>>>> (a VoID file for example)? >>>>> 3) If dereferencing a dataset URI leads to the dataset metadata, >>>>> should there be separate HTML and RDF versions of the metadata? Or >>>>> is it better to have a HTML page with embedded (RDFa) RDF data? >>>>> >>>>> Thanks in advance for your help, >>>>> Frans >>>> >>> >>> >> >> > >
Received on Friday, 22 July 2011 10:16:43 UTC