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RDF Data Cube
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
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.
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/