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Scripts for Assessment the Quality of the LOD Cloud
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LOD Cloud Quality Assessment

This repository contains a number of scripts that enables the quality assessment of the LOD Cloud.

There are two modules in the GIT repository

LODObserver Module

This module contains scripts that crawls the LOD Cloud snapshot and create an observer metadata:

<> a ns1:Dataset ;
    ns2:modified "2015-12-18T13:23:22.256298"^^xsd:dateTime ;
    ns2:source <> ;
    ns1:category "government"^^xsd:string ;
    ns1:namespace <> ;
    ns1:payLevelDomain <> ;
    ns3:dataDump <>,
        <> ;
    ns3:sparqlEndpoint <> .

In this module there are three scripts:

  1. - crawls the snapshot and create the metadata;
  2. - same as lodobserver but adds categories (assigned from the LOD cloud) to the metadata;
  3. - create statistics out of the observed data.

LODQA Module

This module deals with the quality assessment. The Luzzu Quality Assessment framework ( is required to be installed and running beforehand.

In this module there the following files/scripts

  1. - the main script for running the quality assessment. For this, the quality metrics have to be defined in config.ttl;
  2. - this script generates a file with categories for each dataset, which then should be used for the assessment of the Reuse Existing Terms metric;
  3. - downloads the datasets' data dumps and pre-process them prior to assessment (if a dataset's dump is already downloaded, it is not redownloaded).

Scripts folder

In the scripts folder, there are a number of installation scripts (for ubuntu) that are required to run these experiments. We suggest that such installation and experiments are performed on a virtual machine or docker instances.


  1. $ sudo chmod +x
  2. $ sudo chmod +x
  3. $ sudo ./
  4. $ sudo ./

Once everything is installed, run Luzzu as per the instructions in (


This work is licensed under the MIT licensed

How to Cite

  title={Are LOD Datasets Well Represented? A Data Representation Quality Survey.},
  author={Debattista, Jeremy and Lange, Christoph and Auer, S{\"o}ren},


Are LOD Cloud Datasets Well Represented? A Data Representation Quality Survey (Under Review) - pdf


I would like to thank Sören Auer, Christoph Lange, and Aidan Hogan for their valuable contribution towards this work.

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