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RDF and Semantic Web notes

Objective: Parse out the rapidly growing set of tools and datasets for accessing dbpedia and improving dbpedia itself.

Secondary: How the Objectsheet be a receptacle for dbpedia.

§Tools for simple queries against dbpedia

dbpedia search tool links results to the dbpedia browser.

Using the query tool at 3ba.se (Leipzig), you can do a search like: ?composer name ~Björk to find composers with the name like Björk, or anyone with the name Richard: ?person name ~Richard

dbpedia relationship finder type in two resources and this tool finds relationships..

Category browser tool from freebase.com

§Tools for querying dbpedia via Sparql

The SNORQL query builder Takes care of much of the common query overhead for dbpedia (it inserts common PREFIXes and the standard dbpedia FROM statement). Uses async http request to generate results. This tool does not yet work with IE.

My Notes on specific DBpedia queries.

§ Tools for querying general RDF files

MIT/CSAIL Tabulator info including query tutorial and dev information. it would be cool to use simile timeline to show any band's discography.

Ontopia Omnigator [Java Applet] Live 2-d mindmap format browser.

Ontopia World Factbook Navigator

sparql.org : sparqler query (I'm having trouble getting the query engine to understand my queries. When I just have a FROM ... WHERE {...} query, it says there's a missing "limit phrase". when I add the LIMIT phrase, it says ";" is missing. When I add ";", it generates a (SAX) parse error.

§ Discovering data within dbpedia

One challenge with DBpedia and the Semantic Web in general is discovering terms to use when assembling a query. Also, a process for going from specific pages on wikipedia to dbpedia would be helpful (e.g., a bookmarklet to bring up a Wikipedia page in DBpedia). Tools include:

§dbpedia querying: SPARQL

Intros at XML.com, wikipedia, and jena project. Not much at ontoworld.

Query reference guide dajobe.org (pdf)

SPARQL and Exhibit

SPARQL Endpoints: openlinksw and dbpedia (click "advanced" menu item to enter query directly.

Javascript Interfaces: OAT Framework datasource.js. Here's OAT's http query service : Lee Feigenbaum's sparql.js

SPARQL Calendar Demo: Overview by Lee Feigenbaum

Sample SPARQL Queries and content, including ones that I'm developing, both for dbpedia and against other RDF pages.


w3c note

SPARQL-JSON discussion at bnode

timbl's blog at mit csail includes a post on Tabulator.

§RDF Content

Yago presentation Ontology based on Wikipedia.

WordNet is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations. The resulting network of meaningfully related words and concepts can be navigated with the browser. WordNet is also freely and publicly available for download. WordNet's structure makes it a useful tool for computational linguistics and natural language processing. WordNet Search

Periodic table is a representation of the Periodic Table of the Elements in the OWL Web Ontology Language. It provides reference data to support Semantic Web applications in chemistry and related disciplines.

RDF book mashup by Chris Bizer. Accepts an ISBN number (in the URL), queries google base and Amazon, , merges results from the xml responses back into RDF.

Geonames is a geographical database available for download free of charge under a creative commons attribution license. It contains over eight million geographical names and consists of 6.5 million unique features whereof 2.2 million populated places and 1.8 million alternate names. All features are categorized into one out of nine feature classes and further subcategorized into one out of 645 feature codes. Geonames web service

Musicbrainz a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program. Web service, XML services (no json services)

My own FOAF via openlinksw, Disco's, Tabulator's

§RDF Formats

microformats embedding metadata in xhtml

§Reference and info


A Relational View of the Semantic Web general intro to the Semantic web and SPARQL

xmlarmyknife good discussion on this blog about tying this all together.

foaf-o-matic js tool that generates RDF source for FOAF

Discussion of SM approaches by Tim O'Reilly

SM article Eric Miller as subject

Semantic MediaWiki (homepage): SMW uses the fact that such data is already contained in many articles: users just need to "mark" the according places so that the system can extract the relevant data without "understanding" the rest of the text. discussion of SMW and dbpedia

Remember to make sure Apache is configured to serve RDF+XML or make sure you have an "AddType application/rdf+xml .rdf" in your .htaccess file.


intro at XML.com

RDF Family Tree

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Page last modified on July 25, 2007, at 09:14 PM