European Data Portal Version 4.3 – User Manual   Page 53 of 57 
 
 
3.6.2.3 Violations 
The MQA checks for each dataset if it is DCAT -AP compliant. The validation is done on the metada ta 
that is stored in the Virtuoso repository. Therefore, a JSON schema was created and is us ed for 
validation. The user can see the location where the violation occurs and its reason  for each not 
compliant dataset of the selected catalogue.