Linked Data: the return of the Cloud

Linked Data: the return of the Cloud

Summary: The Linked Data Cloud diagram is back; bigger, better, and powered by the CKAN registry tool.

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TOPICS: Cloud
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After more than a year of stagnation, the 'Linked Open Data cloud diagram' found in so many presentations and blog posts is back. It's bigger, it's better, and it points to the continued growth of this disparate community.

//lod-cloud.net/

Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/

Working with Anja Jentzsch of Freie Universität Berlin, Richard Cyganiak of Galway's Digital Enterprise Research Institute (DERI) has returned to the diagram he first drew in 2007, and brought it right up to date. 203 data sets are represented, and together they comprise around 395 million links between over 25 billion RDF statements. Not bad for something that began life as a small academic exercise, but there's a very long way still to go.

Starting as one of Sir Tim Berners-Lee's Design Issues notes, the idea of Linked Data was given credence by the informal Linking Open Data project. As the project web site notes,

The goal of the W3C SWEO Linking Open Data community project is to extend the Web with a data commons by publishing various open data sets as RDF on the Web and by setting RDF links between data items from different data sources.

From those early days, when researchers 'found' data sitting on the web and set about transforming it into RDF by themselves, the initiative has grown significantly. Governments, media properties from the BBC to the New York Times, and retailers such as Best Buy have been amongst those to set about plugging their own data into the increasingly rich network.

Links between these data sets are established when one draws upon concepts defined in another. GeoNames, for example, is seen by many as a useful resource to draw upon in describing places. Rather than fuzzily talking about 'Paris,' I might make the statement unambiguous by referring to this Paris rather than that one. For a dataset (describing works of art, for example) in which location is not key, it's far easier to let someone else worry about recording where Paris is, what country it's in, how big it is etc rather than do it all myself.

This concept of linking from one resource to another is clearly key, but the relative dearth of connections on the diagram shows that there is still some way to go. DBpedia remains disproportionately important, and whilst it's unlikely that every resource will ever meaningfully connect to every other resource, some more connections would be valuable.

The latest iteration of the cloud diagram is based upon information that the community was invited to record in the CKAN data repository, which should make data collection and update easier and more accurate. In principle, future versions of the diagram could be generated programmatically as the data changes.

This month's revision of the Linked Data cloud is a useful illustration of progress within the community. Much remains to be done, both in terms of clarifying licenses and by collecting even more data. There is also work to do in adequately explaining what people might find. The diagram does link through to descriptions of each resource, but the 'explanations' are all-too-often only meaningful to people knowledgeable enough not to need an explanation in the first place!

This repository contains data from JISC, who fund research and infrastructure in the UK.

What data? About what sort of thing?

Airport data from Our Airports published as RDF

What sort of data? Where in the world?

Topic: Cloud

Paul Miller

About Paul Miller

Paul Miller provides consultancy and analysis services at the interface between the worlds of Cloud Computing and the Semantic Web.

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  • RE: Linked Data: the return of the Cloud

    LOL!
    james347
  • RE: Linked Data: the return of the Cloud

    "...the return of the Cloud" it went away recently? Huh.
    james347
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    Working in the Pink Diamond Mine.... large discovery....

    Create Chaos Pandoria13@hotmail.com

    A very unique occurrence in nature has been found;
    analyzed; assessed; weighed; tested; enhanced;
    implemented and deployed in the pink diamond mine's of the Mainframes'.

    www.z390.org and www.zCOBOL

    zCICS; zVSAM; zSORT etc... etc... etc...

    read all about it !!!!!!!!!! Then Try IT !!!!!!!!

    Supporting Newest z196 instruction set execution through emulation x86 & x64 in JAVA

    Interfaced with IBM DB2 Express-C batch SQL capabilities; [ I actually help in doing some of this, really ]

    Deployed onto the CloudShare Pro CLOUD [ I actually DID this in Jan of 2011, really ]

    Running on Win & Linux or J2SE supported platform's

    100% JAVA Open Source... 100% F R E E ...

    caution... please, read the ton's and ton's of documentation provided, it saves you a lot of time...
    caution... please, ton's and ton's of examples, it saves you a lot of time...
    caution... please, join the group, and read all of the group posting's from the beginning, it saves you a lot of time...
    caution... please, ask questions, you will be amazed at the cut right to the chase on the subject requiring attention,
    it saves you a lot of time...
    caution... please, you might find yourself rummaging around the attic or garage for that dang old source code you developed back when,
    that may not save you time...
    caution... please, you might just actually save your company and you, very serious monies...
    caution... please, SHARE, share, ShArE, sHaRe...
    caution... please, introduce yourself, you just might find that Old Code Slinger Buddy from back a while ago, you forgot about...
    caution... please, don't take my word for it, that it WORK's, try it, you find a REAL BUG [$ 1.00 reward ],
    Mr. Don Higgin's will rule if it a BUG or NOT...
    caution... please, believe found myself doing that nasty bit fiddling thing again,
    and I can do that in xxxx instructions, like name that tune...
    caution... please, believe found bunche's of JAVA, IBM HLASM Assembler, COBOL, WIN, LINUX & etc........
    WIZARD's still exist, that were locked away in the back room like me.
    caution... please, O P E N S O U R C E is the only way to GO...
    caution... please, you can donate or not donate, that is entirely up to YOU...
    caution... please, it is advisable, to look out the window and see if the sun has risen...
    caution... please, Lot's of thing's to get involved with, no offer of assistance has ever been refused so far...
    caution... please, ... ... ... .... .... flower box's are still kool

    caution... please, Adviable to Display Entering Pink Diamond Mine Unlimited Work Zone Area...

    Pandoria13@hotmail.com

    2011 is gonna,,,,, Rock, and Rock, and Rock.......
    Page-Cray