[ckan-discuss] [anja at anjeve.de: ANN: LOD Cloud - Statistics and compliance with best practices]

William Waites william.waites at okfn.org
Tue Oct 19 17:21:27 BST 2010

----- Forwarded message from Anja Jentzsch <anja at anjeve.de> -----

Date: Tue, 19 Oct 2010 17:56:58 +0200
From: Anja Jentzsch <anja at anjeve.de>
Subject: ANN: LOD Cloud - Statistics and compliance with best practices
To: Semantic Web <semantic-web at w3.org>, semanticweb at yahoogroups.com

Hi all,

in the last weeks, we have analyzed which data sources in the new 
version of the LOD cloud comply to various best practices that are 
recommended by W3C or have emerged within the LOD community.

We have checked the implementation of the following nine best practices:

1. Provide dereferencable URIs
2. Set RDF links pointing at other data sources
3. Use terms from widely deployed vocabularies
4. Make proprietary vocabulary terms dereferencable
5. Map proprietary vocabulary terms to other vocabularies
6. Provide provenance metadata
7. Provide licensing metadata
8. Provide data-set-level metadata
9. Refer to additional access methods

The compliance with the best practices was either checked manually or by 
using scripts that downloaded and analyzed some data from the data sources.
We have added the results of the evaluation in the form of tags to the 
LOD data set catalog on CKAN [1].

We are now happy to release the first statistics about the structure of 
the LOD could as well as the compliance of the datasets with the best 
The statistics can be found here:


The document contains an initial, preliminary release of the statistics. 
If you spot any errors in the data describing the LOD data sets on CKAN, 
it would be great if you would correct them directly on CKAN.

For information on how to describe datasets on CKAN please refer to the 
Guidelines for Collecting Metadata on Linked Datasets in CKAN [2].

After your feedback and corrections, we will then move the corrected 
version of the statistics to http://www.lod-cloud.net/ (around October 

Have fun with the statistics and the encouraging as well as 
disappointing insights that they provide.


Chris Bizer, Anja Jentzsch and Richard Cyganiak

[1] http://www.ckan.net/group/lodcloud

----- End forwarded message -----

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