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Re: Source file of the LOD connectivity patterns

From: Frederick Giasson <fred@fgiasson.com>
Date: Tue, 17 Mar 2009 16:32:40 -0400
Message-id: <49C008E8.3090503@fgiasson.com>
To: marko@lanl.gov
Cc: public-lod@w3.org
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 

Hope this is helpful,

Take care,

Received on Tuesday, 17 March 2009 20:33:19 UTC

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