Infovore, the RDF processing framework that produces :BaseKB has passed a
final round of tests in the AWS cloud. As a result, new :BaseKB RDF files are
available at
http://basekb.com/
Two files have been created from the last quad dumps that have been released by
Freebase on 2012-11-04. :BaseKB Pro consists of nearly all nontrivial facts
from Freebase, whereas :BaseKB Lite is restricted to topics that exist in
DBpedia. By loading either product into a triple store, you can run SPARQL
queries that produce correct answers. (:BaseKB lacks on the order of 10^4
facts that cannot be resolved because of ill-formedness in the “one true graph”)
This version of :BaseKB differs from previous versions in that the :knownAs
predicate is no longer asserted. The infovore framework contains the
basekb-tools, which rewrite “human friendly” identifiers into unique mid
identifiers, just as the MQL query engine for graphd does. This “grounded
SPARQL” is used extensively inside Infovore, even in phases before the major
reconstruction of Freebase is available.
The toolkit, as shipped, works with and out-of-the-box the open source
edition of Openlink Virtuoso. Configuration can be done via the Spring
framework, so it is straightforward to adapt to any triple store that uses
SPARQL protocol endpoint or otherwise has Jena drivers.
I’m finishing up the documentation for the 1.0 release of Infovore,
https://github.com/paulhoule/infovore
which will be the exact software used to create the latest version of :BaseKB.
Optimized for current four-core processors, anyone can use this tool to
convert a Freebase quad dump to industry-standard RDF in less than twelve
hours; Infovore contains a test suite that demonstrates successful name
resolution and SPARQL queries against either :BaseKB Lite or :BaseKB Pro.
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