Ora Lassila on Erdös Numbers: So far, I believe my own Erdös number is at most 6, given, for example, the following path: me, James Hendler, Lynn Stein, David Karger, Robert Tarjan, Stephen Hedetniemi, Paul Erdös. The real problem, I find, is that once you start pondering about path lengths, you cannot stop trying to […]


Ian Davis shows how even the smallest RDF graph has multiple XML serializations. He missed some variations: (i) rdf:RDF is optional, and (ii) rdf:type has special-case treatment in the grammar (iii) XML base can interact with URIs. <rdf:Description xml:base=”” xmlns:foaf=”” xmlns:rdf=”” foaf:name=”Eve” rdf:type=””> <foaf:homepage rdf:resource=”~eve”/> </rdf:Description> This variety should not be suprising. A good question […]

RDFAuthor does SPARQL

Damian is working on a new version of RDFAuthor that generates SPARQL queries (instead of the older Squish notation). It can also (not sure which protocol(s)) get results from a query service. Here’s a screenshot: The automatically generated (and hence not 100% user-friendly) query was as follows: SELECT * WHERE { ?var_4 <http ://> ?var_1 […]

Google boost Jabber + VOIP, Skype releases IM toolkit, Jabber for P2P SPARQL?

Interesting times for the personal Semantic Web: “Any client that supports Jabber/XMPP can connect to the Google Talk service” Google Talk and Open Communications. It does voice calls too, using “a custom XMPP-based signaling protocol and peer-to-peer communication mechanism. We will fully document this protocol. In the near future, we plan to support SIP signaling.” […]

SPARQLing Protégé-OWL Jena integration

The Jena ARQ SPARQL engine has been very rapidly integrated into Protégé. Nice work from Holger Knublauch, and from Andy Seaborne who explained how Protégé’s native RDF Java structures could manifest themselves via Jena interfaces so that the ARP query engine could work against Protégé data. He also gave a handy overview of the ARP […]

hello planetrdf

I’ve finally updated and customised WordPress, tweaked the links to use RSS1, and discovered that I can get category-specific feeds, eg. technology. Planet RDF is now taking that category feed (thanks Dave!), which allows me to vent freely on other things without worrying too much about cluttering up a predominantly tech-oriented site. That said, I […]

Syndicating EXIF location info, nearly

I’ve been trying to get lat/long GPS data embedded in my photos, before I upload them to Flickr, so that will make use of the data. So far, I can only get that site to use explicit “geo:lat=123.345” based flickr-tagging; embedded EXIF seems ignored. See ongoing discussion in the Flickr GeoTagging group.

geobloggers: “Network Link” in Google Earth

This is the hidden gem of Google Earth. Adding a “Network Link” allows you to fetch KML data from remote servers. It does this in two ways, Time Based or Location Based. So *anyone* can add dynamic data to Google Maps. Apparently KML is based on GML. I don’t know Keyhole/Google’s work differs. There seems […]

Sample SPARQL query

PREFIX dc: <> SELECT ?book ?title ?authorname WHERE { ?book dc:creator ?author . ?author dc:type <http ://> . ?author dc:title ?authorname . ?book dc:title ?title . } …works with rdf data describing some books by painters. I tested in Dave Beckett’s Redland-based online SPARQL demo. The query finds 5 results. Seems to have some encoding […]

Data syndication

There have been various developments in the last week, via Planet RDF, on the topic of data syndication using RSS/Atom. Edd Dumbill on iTunes RSS extensions; a handy review of the extensions they’ve added to support a “podcasting” directory. See also comments from Danny. Nearby in the Web, Yahoo! and friends are still busy with […]

“Mono : A Developer’s Notebook” kitabının yazarlarından ve yazrı Edd Dumbill ile söyleÅŸi…

Edd Dumbill was interviewed in the Turkish .NET site Anlamsal web(semantic web) dünyada popüler olarak kullanılması hakkında ne düşünüyorsunuz? Edd: Türkçe : Anlamsal(semantic) web in bize saÄŸladığı zaten bir çok kullanışlı yönü var. Özellikle de konu alanlarının doÄŸal olarak kısıtlandığı organizasyonlarda bunu görmek mümkün. WWW(World Wide Web) ye baktığımız zaman küçük parça verilerin kullanılabilir […]

British Board of Film Classification RSS feeds and Movie metadata

The BBFC have several RSS feeds on their site, carrying information about their judgements on various cinematic works for a UK audience. Recent film decisions, recent adult (sex) videos and films, etc. Each entry in the feed points to a descriptive page and summarises a BBFC judgement in a simple textual description, eg. “The BFC […]