RDF関連メモ on Planet masaka : 2008-04

Planet masakaから2008年4月のRDF／セマンティック・ウェブ関連メモを抽出してまとめたものです。

2008-04-28

OAI2LOD Server [MediaSpaces]
OAI2LOD Server exposes any OAI-PMH compliant metadata repository according to the Linked Data guidelines. This makes things and media objects accessible via HTTP URIs and query able via the SPARQL protocol (at 11:48)

The Programmes Ontology [BBC - Ontologies]
providing a simple vocabulary for describing programmes. It covers brands, series (seasons), episodes, broadcast events, broadcast services, etc.The programme model is inspired from the PIPS database schema, used at the BBC. uses FRBR like model (at 22:18)
DBpedia Mobile [wiki.dbpedia.org]
is a location-centric DBpedia client application for mobile devices consisting of a map view, a Fresnel-based Linked Data browser and a GPS-enabled launcher application. Map View + Marbles Linked Data browser (at 20:32)
Linked Data: Principles and State of the Art
The Web of Documents and the Web of Data; The W3C SWEO Linking Open Data Project; What is next? - by Christian Bizer, Tom Heath, Tim Berners-Lee at WWW 2008 (PDF) (at 12:48)

Anatomy Lens - alphaWorks Services
a search engine on PubMed articles, uses ontologies as knowledge bases to improve the recall of a search, integrated FMA, Gene Ontology (GO), Gene Ontology Annotations (GOA), MeSH, and PubMed. (at 20:40)
OWL 2 Web Ontology Language:Profiles
EL++ enables polynomial time algorithms for the reasoning tasks; in DL-Lite, conjunctive query can be implemented /w RDB; OWL-R enables implementation of reasoning algorithms by forward chaining rules applied to triples of RDF (as of 2008-04-11) (at 01:31)
RE: First crack at profiles in primer [public-owl-wg]
Bottom line: OWL-R allows me to work with RDF data and OWL in a pretty agile and ad-hoc way... it is a /pragmatical/ advantage for certain development scenarios - by Michael Schneider, 2008-04-13 (at 01:24)

managed to modify XSLT so that it could generate RDF from new this-week-sw as well as from old ones (original post at 23:41)
failed to generate RDF bookmark from @danja's this-week-semanticweb, due to design change of Nodalities weblog. Fatal to XSLT bsed GRDDL (original post at 22:55)

OWL 2 Web Ontology Language: Primer
intro including orientation for those coming from other disciplines, an example showing how OWL2 can be used to represent simple info and then more complex info, how OWL2 manages ontologies, and the distinctions between the various sublanguages of OWL2. (at 11:25)

RFC 5147: URI Fragment Identifiers for the text/plain Media Type
make it possible to refer to specific parts of a text/plain MIME entity, using concepts of positions and ranges, which may be applied to characters and lines. e.g. http://example.com/text.txt#char=100 or text.txt#line=10,20 (at 09:51)
The semantic web start making sense [economist.com]
it has been hard to persuade those who post web pages to include all the semantic-web stuff; examples trying to make the breakthrough are: Reuters' Calais, Radar's Twine, Qitera, etc - 2008-04-09 (at 00:52)

Experiences with the conversion of SenseLab databases to RDF/OWL
describes the process of converting relational databases into OWL, i.e. how represented some of the databases in RDF and OWL, and discusses the advantages and disadvantages of these representations (at 18:45)
HCLS Knowledgebase
outlines which resources were integrated, how the KB was constructed using freely available triple store technology, how it can be queried using SPARQL, and what resources and inferences are involved in answering complex queries (at 18:39)

Introducing SPO(G) [Binary Relations]
SPO(G), a mechanism for echange of named graphs, is simply a constrained SPARQL Query Results XML Format: It needs to have three or four variables, s, p, and o must be present, with g being optional (making it YARS) - by mortenf, 2008-04-04 (at 13:27)

heh, Universal RDF Encoder is a sort of RDF version of RFC 5242 (original post at 20:56)
RFC 5242 says "A" is "a<UC>" and "w" is "u<ZWCJ>u" in i18n domain names with Generalized Unified Character Code. cute ;-) (original post at 10:19)
RDF and social networks [bobdc.blog]
Better than XML! Defining a vocabulary instead of a DTD is the low-hanging fruit. It doesn't reduce the work to do by simplifying it, but by reducing the scope: by forgetting about the data structures - by Bob DuCharme, 2008-04-01 (at 02:23)