RDF Data Cube

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May 2012

Sarven Capadisli:

I've worked on World Bank Linked Data [1] which uses the Data Cube vocabulary. The dataset is composed of World Development Indicators, World Bank Finances, World Bank Climate Change, World Bank Projects and Operations.

Also started on some preliminary visualizations at [2].

Data dumps are at [3]. See VoID file [4] if you need to automate or get more information about the datasets.

If you can share what you are up to publicly or off the list, I'd love to take a look.

[1] http://worldbank.270a.info/ [2] http://worldbank.270a.info/view [3] http://worldbank.270a.info/data/ [4] http://worldbank.270a.info/.well-known/void

Feb 2012

We have been working on an OLAP query engine (olap4ld) over RDF data conforming to the RDF Data Cube vocabulary.

At 1 you find a link to the open-source code, and a demo + screencast of olap4ld in use.

There is still lots of work needed for the tool to be easily applied by other parties, I hope to find the time soon to make those changes to the code.

Best,

Benedikt

Feb 2012

The W3C Government Linked Data Working Group has started work towards making Data Cube a W3C Recommendation. See here: http://www.w3.org/2011/gld/wiki/Data_Cube_Vocabulary

There's an Editor's Draft of the spec (content-wise so far identical to the old spec on Google Code): http://dvcs.w3.org/hg/gld/raw-file/default/data-cube/index.html

There's also a very rough first cut on a Use Cases and Requirements document: http://www.w3.org/2011/gld/wiki/Data_Cube_Vocabulary/Use_Cases

Dave and Richard, FZI's Benedikt Kämpgen and are working actively on this.

Other

https://github.com/timrdf/csv2rdf4lod-automation/wiki/Example:-vivohack11 - we used data cube to expose coauthor SNA.

http://groups.google.com/group/publishing-statistical-data?hl=en_US Curran inquiry 14 dec 2011

http://publishing-statistical-data.googlecode.com/svn/trunk/specs/src/main/html/cube.html

http://opendatacommunities.org/datasets

http://wiki.planet-data.eu/web/Datasets

Environment Agency Bathing Water Quality data uses the cube vocabulary. For a starting set of links see: http://www.epimorphics.com/web/projects/bathing-water-quality

http://sns.linkedscotland.org/

ESDS International has recently completed a project where they looked at using the Data Cube Vocabulary to describe world back data, here’s the link to that data.

http://www.esds.ac.uk/international/access/LDaccess.asp

In [1], we have used QB with Mondrian and XML/A clients.

Momentarily, we are working on an OLAP4J implementation [2] to allow common OLAP clients to access QB data. So far, for visualization, we have been thinking of using Saiku [3], which connects to the OLAP4J API. As soon as I have a demo, I can post it here.

Regards,

Benedikt

[1] http://www.aifb.kit.edu/web/Inproceedings3211 [2] http://www.olap4j.org/ [3] http://analytical-labs.com/