The term Linked Data refers to a set of best practices for publishing structured data on the Web. These principles have been coined by Tim Berners-Lee in the design issue note Linked Data. The principles are:
- Use URIs as names for things
- Use HTTP URIs so that people can look up those names.
- When someone looks up a URI, provide useful information.
- Include links to other URIs. so that they can discover more things.
The idea behind these principles is on the one hand side, to use standards for the representation and the access to data on the Web. On the other hand, the principles propagate to set hyperlinks between data from different sources. These hyperlinks connect all Linked Data into a single global data graph, similar as the hyperlinks on the classic Web connect all HTML documents into a single global information space. Thus, LinkedData is to spreadsheets and databases what the Web of hypertext documents is to word processor files. The Linked Open Data cloud diagramms give an overview of the linked data sets that are available on the Web.
Linked Data Presentations:
- Tim Berners-Lee speaks at TED2009 about Linked Data using the LOD data cloud and the Linking Open Drug Data cloud as examples. See video of the talk and his slides.
- Chris Bizer, Tom Heath, Tim Berners-Lee: Linked Data: Principles and State of the Art talk at the W3C Track at WWW2008.
- "Tabulator - A Semantic Web Browser" - TimBernersLee (WWW2007)
- "DBpedia - Querying Wikipedia Like a Database" - ChrisBizer (WWW2007)
- "How to Combine the Best of Web2.0 and a Semantic Web: Examples from Revyu.com" - TomHeath (WWW2007)
- design issue note by TimBL
- Tabulator: Exploring and Analyzing linked data on the Semantic Web, Tim Berners-Lee et. al, SWUI '06
- Linked Data - The Story So Far. Bizer, Heath, Berners-Lee, IJSWIS, 2009.
- Linked Data: Evolving the Web into a Global Data Space. Heath, Bizer, Morgan & Claypool Publishers, ISBN 978160845431, 2011.
- Bizer, Cyganiak, Heath: How to publish Linked Data on the Web (Tutorial)
- Sauermann et al.: Cool URIs for the Semantic Web
- Alistair Miles et al.: Best Practice Recipes for Publishing RDF Vocabularies
- Richard Cyganiak: Debugging Semantic Web sites with cURL
- Bizer, Gauß, Cyganiak The Sematic Web Client Library
- Christian Bizer et al.: Interlinking Open Data on the Web
- Concerns about the downside to an HTTP-scheme monopoly for RDF. (See HCLS thread also: Does follow-your-nose apply in the enterprise?)
- Mobile Design and Development
- Deploying Linked Data (using Virtuoso)
Workshop Series about Linked Data at the WWW conferences
- Linked Data on the Web Workshop (LDOW2014) at WWW2014 (April 2014, Seoul, Korea)
- Linked Data on the Web Workshop (LDOW2013) at WWW2013 (May 2013, Rio de Janeiro, Brazil)
- Linked Data on the Web 2010
- Linked Data on the Web 2009
- Linked Data on the Web 2008
Other Workshops about Linked Data
- 5rd International Workshop on Consuming Linked Data (COLD 2014) at ISWC 2014 (October 2014, Riva del Garda, Italy)
- 4rd International Workshop on Consuming Linked Data (COLD 2013) at ISWC 2013 (October 2013, Sydney, Australia)
- 1st International Workshop on Consuming Linked Data (COLD 2010) at ISWC 2010
- Linking Open Data Community
- Linked Data - Connect Distributed Data across the Web
- Wikipedia Entry on Linked Data , please update.
Examples of Linked Data:
Client side tools:
- Semantic Web Client Library
- OpenLink Data Explorer
- DISCO Hyperdata Browser
- Ripple scripting language
- SWI Semantic Web Client
- Semantic Address Book
Server side tools:
- dbview.py by DanConnolly, Rob Crowell and TimBL
- Virtuoso - "Sponger" component of Virtuoso's SPARQL Engine, RDF Views of SQL, and the HTTP engine's Linked Data Deployment features
- D2R Server
- P2R - expose Prolog knowledge base as linked data (when bundled with UriSpace)
- SPARQL2XQuery - Bridging the Gab between the XML and the Semantic Web Worlds.
- SPARQL-RW - Ontology Mapping and SPARQL Query Rewriting in the Web of Linked Data.
- Linked Media Framework - Open Source Linked Data Server and publishing suite
- razorbase - a linked data browser which employs faceted browsing and set-based browsing
- Dynamic Data Web Page - Twitter
- Collection of DBpedia based Dynamic Data Web Pages
- GRDDL Test Suite - OpenLink RDF Browser permalink
- GRDDL Test Suite Dynamic Data Page
- Hotel Ratings & Reviews - Dynamic Data Page
- Hotel Ratings & Reviews - SPARQL Query Definition File (.rq)
- WWW2007 Schedule via OpenLink RDF Browser consuming WWW 2007 Event URI from TimBL
- RKBExplorer Application to find out about CS research - uses many Linked Data sites, but can you tell?
Extending Linked Data:
- BreadcrumbProtocols are conventions by which information is left by data publishers to allow data consumers to follow.
- SemanticSitemap: Advertising the presence of RDF data on a host
- foaf+ssl uses a WebID and LinkedData to create a web of trust authentication architecture
Open request, since I simply don't know any of you:
When I read the excitement about LinkedData, I feel over-looked and unappreciated; I was talking about this in 2004, to everyone I could get to listen to me, about this idea. (See: NetworkedData.)
When I read "old page on related topic" on this page, I feel marginalized.
I thought this was the most important part of the SemanticWeb. I've told all my friends in project planning software Seattle, and I've told people this at WikiSym. I wrote about this here on and various other places on the Internet. Here's me saying it in 2004: "In fact, the semantic web is about networked data. I believe it should be explained to techies in those terms." (2004) I wrote nLSD based on this interpretation, and then MachineCodeBlocks (2005.) I don't know anyone in the community, so I didn't say much, but I did talk with sbp.
I've made it my life's mission to better the world through collaboration technologies, so I need some recognition, so that people are inclined to take me seriously. (example of where it could have helped)
Will someone (anyone) recognize my participation in the emergence of this idea? I am a Python programmer, I'm handy with wx (GUI programming,) and DanC's noted I'm a quick study. I can contribute a lot. Will someone give me a share in the (granted, small, footnote-sized) story, about the recognition of LinkedData?
Please feel welcomed to the Linking Open Data (LOD) Community :-) Remember, the Web is about building connections. As you've stated, "time" is a product of "awareness", so your Linked Data fingerprints aren't lost time with regards to our very sticky Web :-)
Please to the following to fully exposed your Linked Data heritage:
- Sign-up to the mailing list
- Drop an introductory note (basically a link to this page)