Virtuoso,
I’m using the LOD Cloud Cache [1] as a sample of the LOD Cloud, and wanted to
make sure that I was using it to its full potential.
Thanks for such a useful resource.
Could you comment on the following?
A)
What portion of Linked Data is in the cache?
i.e., what methodology is used to load data into the cache?
Does it use crawls, load data dumps, use specific seed URIs or datasets?
Do the lists at http://datahub.io/group/lodcloud or
http://datahub.io/dataset?tags=lod influence the loads?
Unfortunately, http://lod.openlinksw.com/facet_doc.html mentions
http://lod.openlinksw.com/void/Dataset, but that 404s.
B)
How often is new Linked Data added to the cache?
C)
Is the default graph the only graph that one needs to query to “query all of
it”?
i.e., Can you verify http://lod.openlinksw.com/sparql's claim that:
<http://lod2.openlinksw.com/sparql> sd:feature
<http://www.w3.org/ns/sparql-service-description#UnionDefaultGraph>
(and, what’s the difference between http://lod.openlinksw.com/sparql and
http://lod2.openlinksw.com/sparql?)
D)
Is the following query an appropriate way to find out how many foaf:Person
instances are in the cache?
I get 141,721,466 people.
select count(?s) where {?s a <http://xmlns.com/foaf/0.1/Person>}
E)
Is the following query an appropriate way to find out how many instances
foaf:knows another?
I get 84 “knowers”.
select count(distinct ?s) where {?s <http://xmlns.com/foaf/0.1/knows> []}
Thanks so much for your time.
Regards,
Tim
[1] http://lists.w3.org/Archives/Public/public-lod/2013May/0154.html
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