do we need PropertyReference UUIDs in the ontologies?

[VladimirAlexiev]

https://energy.referencedata.eu/PropertyReference.ttl has a number of props and includes UUIDs, eg:

<http://energy.referencedata.eu/PropertyReference/VsConverter.targetPowerFactorPcc> a nc:PropertyReference,
        skos:Concept ;
    nc:PropertyReference.mRID "d1a5fae7-a735-4556-b7af-c447aba7e545" ;
    nc:PropertyReference.name "VsConverter.targetPowerFactorPcc" ;
    dcterms1:identifier "urn:uuid:d1a5fae7-a735-4556-b7af-c447aba7e545" ;
    skos:definition "Power factor target at the AC side, at point of common coupling. The attribute shall be a positive value." ;
    skos:inScheme "http://energy.referencedata.eu/PropertyReference" ;
    skos:prefLabel "VsConverter.targetPowerFactorPcc" ;
    skos:topConceptOf "http://energy.referencedata.eu/PropertyReference" .

Do we need to include these UUIDs in the ontologies?

BTW, there are some defects: inScheme, topConceptOf, dct:idenfitier should be URIs not strings.