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Re: Source file of the LOD connectivity patterns

From: Marko A. Rodriguez <marko@lanl.gov>
Date: Tue, 17 Mar 2009 15:18:15 -0600 (MDT)
Message-ID: <11269.>
To: "Frederick Giasson" <fred@fgiasson.com>
Cc: public-lod@w3.org
Hi Frederick,

Thank you for your thorough response. Yes--it looks like an LOD voID
instance is the thing to have.

I originally created my csv of the LOD cloud by painstakingly going from
the OmniGraffle PNG to a csv file by hand (see a visualization of that csv
file in [1]). If I had the original OmniGraffle source, I could ensure
accuracy in this manual method by removing links in the Ommnigraffle
representation as I created them in the csv representation. If someone
could provide me that Omnigraffle source I could create a clean LOD csv
file and provide the group with it for their interests much like Frederick
did with the UMBEL work.


Thanks so much,
Marko A. Rodriguez


> Hi Marko!
>> I'm finishing up the final version/draft of the LOD March 2004 analysis
>> (see the first draft at [1]). I was wondering if there is a easily
>> parseable format for getting the graph structure of the Linked Data
>> cloud.
>> That is, something analogous to how [2] provides [3]. Hopefully
>> Omnigraffle isn't the "raw" data. :)
>> [1] http://arxiv.org/abs/0903.0194
>> [2] http://www.umbel.org/lod_constellation.html
>> [3]
>> http://www.umbel.org/lod_constellation/class_level_lod_constellation.csv
> I think the LOD graph has only been created and maintained by hands so
> far. So I cannot really talk about it.
> However, I can talk about UMBEL and how we created the graph. Basically,
> we have a script that query a triple store where all ontologies
> descriptions are indexed. From these queries, we built-up the CSV file
> you mentioned above. We use RDFS & OWL properties used to describe these
> ontologies to build-up the graph of relationship between all the classes
> of each ontology that is linked to UMBEL.
> Once we generated the CSV file of relationships between classes linked
> to UMBEL, we import it in Cytoscape to create the actual graph that you
> also mentioned above.
> So, what is needed in order to to the same for the LOD cloud is a
> mixture of things. First, people have to define all the criterias that
> lead to a link between two datasets (for example, is only a link, with
> any properties, between two resources of two datasets enough to create a
> link between the two dataset in that cloud? (I doubt), Etc.). Once you
> have these criterias, you have to query each dataset, given these
> criterias, to build-up the linkage between each dataset bubble.
> I think Void should be used to describe these datasets, and to describe
> the linkage; however I am not sure if the linkage criterias are in
> place. Having the Void representation of the linkage of all dataset in
> the LOD cloud would be helpful to make the query against that data
> instead of each dataset to create the actual CSV file to import in
> Cytoscape.
> Hope this is helpful,
> Take care,
> Fred
Received on Tuesday, 17 March 2009 21:19:40 UTC

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