Add property "legalMaterial" to describe statistical classifications

[tfrancart]

INSEE has insee:legalMaterial (http://rdf.insee.fr/def/base#legalMaterial)

Indicate that ELI can be used as a value : https://eur-lex.europa.eu/eli-register/about.html

See http://rdf.insee.fr/sparql/describe?uri=http%3A%2F%2Frdf.insee.fr%2Fdef%2Fbase%23legalMaterial&type=Predicate&default-graph-uri=data

[ChLaaboudi]

In Eurostat, we use eli:based_on for referencing the legal basis.
Example:
:cn2021 a skos:ConceptScheme;
skos:prefLabel "Combined Nomenclature, 2021 (CN 2021)"@en;
eli:based_on "http://data.europa.eu/eli/reg_impl/2020/1577/oj"^^xsd:anyURI, "http://data.europa.eu/eli/reg_impl/2020/2159/oj"^^xsd:anyURI.

[tfrancart]

Hello Christine

As eli:based_on has a domain declared on eli:Work (in latest ELI ontology, maybe not yet officially released), this implicitly makes the ConceptScheme a FRBR Work; which is not entirely wrong, in a sense.
Relying on eli:based_on would have the advantage of relying on something with a wider scope than an INSEE-specific property. @FranckCo do you have an opinion ?

[FranckCo]

Hello

I agree that eli:based_on is preferable.

[tfrancart]

This is adressed in commit 5a0fbae

[tfrancart]

@ChLaaboudi warning, the values must be URI, not literals with datatype xsd:anyURI, so :

:cn2021 a skos:ConceptScheme;
skos:prefLabel "Combined Nomenclature, 2021 (CN 2021)"@en;
eli:based_on <http://data.europa.eu/eli/reg_impl/2020/1577/oj>, <http://data.europa.eu/eli/reg_impl/2020/2159/oj">.

[ChLaaboudi]

@tfrancart Thanks for the feedback. We are going to implement it.