Missing DCAT properties in the current MOD3

[jonquet]

If we follow the idea of taking all the properties of the DCAT object a MOD object inherits from, then we are missing the following one in the current version of MOD:

On the SemanticArtefact class:

• [x] https://www.w3.org/TR/vocab-dcat-2/#Property:resource_qualified_relation
• [x] https://www.w3.org/TR/vocab-dcat-2/#Property:resource_qualified_attribution
• [x] https://www.w3.org/TR/vocab-dcat-2/#Property:resource_has_policy
• [x] https://www.w3.org/TR/vocab-dcat-2/#Property:resource_is_referenced_by

On the SemanticArtefactDistribution class:

• Check out the adms:AssetDistribution class
• Check out the dcat:Distribution class

[jonquet]

Addressed with 3.2