Category Archives: foaf4lib

Linked Literature, Linked TV – Everything Looks like a Graph

Ben Fry in ‘Visualizing Data‘: Graphs can be a powerful way to represent relationships between data, but they are also a very abstract concept, which means that they run the danger of meaning something only to the creator of the graph. Often, simply showing the structure of the data says very little about what it actually [...]

Lonclass and RDF

Lonclass is one of the BBC’s in-house classification systems – the “London classification”. I’ve had the privilege of investigating lonclass within the NoTube project. It’s not currently public, but much of what I say here is also applicable to the Universal Decimal Classification (UDC) system upon which it was based. UDC is also not fully [...]

Subject classification and Statistics

Subject classification and statistics share some common problems. This post takes a small example discussed at this week’s ODaF event on “Semantic Statistics” in Tilberg, and explores its expression coded in the Universal Decimal Classification (UDC). UDC supports faceted description, providing an abstract grammar allowing sentence-like subject descriptions to be composed from the “raw materials” defined [...]

Skosdex: SKOS utilities via jruby

I just announced this on the public-esw-thes and public-rdf-ruby lists. I started to make a Ruby API for SKOS. Example code snippet from the readme.txt (see that link for the corresponding output): require “src/jena_skos” s1 = SKOS.new(“http://norman.walsh.name/knows/taxonomy”) s1.read(“http://www.wasab.dk/morten/blog/archives/author/mortenf/skos.rdf” ) s1.read(“file:samples/archives.rdf”) s1.concepts.each_pair do |url,c| puts “SKOS: #{url} label: #{c.prefLabel}” end c1 = s1.concepts["http://www.ukat.org.uk/thesaurus/concept/1366"] # Agronomy puts [...]

Family trees, Gedcom::FOAF in CPAN, and provenance

Every wondered who the mother(s) of Adam and Eve’s grand-children were? Me too. But don’t expect SPARQL or the Semantic Web to answer that one! Meanwhile, … You might nevetheless care to try the Gedcom::FOAF CPAN module from Brian Cassidy. It can read Gedcom, a popular ‘family history’ file format, and turn it into RDF [...]

Cross-browsing and RDF

Cross-browsing and RDF While cross-searching has been described and demonstrated through this paper and associated work, the problem of cross-browsing a selection of subject gateways has not been addressed. Many gateway users prefer to browse, rather than search. Though browsing usually takes longer than searching, it can be more thorough, as it is not dependent [...]

SKOS deployment stats from Sindice

This cropped up in yesterday’s W3C Semantic Web Coordination Group telecon, as we discussed the various measures of SKOS deployment success. I suggested drawing a distinction between the use of SKOS to publish thesauri (ie. SKOS schemes), and the use of SKOS in RDFS/OWL schemas, for example subclassing of skos:Concept or defining properties whose range [...]