mapping relations between classes, properties, concepts

1) the relation "skos:exactMatch" between frbr:Manifestation and bibo:Document must be changed because:

The skos mapping relations (exactMatch, closeMatch) imply that Manifiestation and Document are skos concepts.
we can use owl:equivalentClass or rdfs:subClassOf, taking into account the implications, as outlined at see https://stackoverflow.com/questions/4192435/owls-equivalentclass-vs-subclassof (thanks @gkirtzou for spotting this). To be honest, I find rdfs:subClassOf "less dangerous"
2) Have we found the mapping relation between frbr:Manifestation and bibo:Document somewhere or is this something we have decided? I didn't find anything at the two ontologies but I may have missed it. The reason I ask is that we are mapping two classes that are defined in other vocabularies. I don't think we should do this. We can get what we want (i.e. reusing properties) by saying that ms:DatasetDistribution is rdfs:subClassOf frbr:Manifestation and rdfs:subClassOf bibo:Document. 3) We should add the relations we have at https://lexbib.elex.is/wiki/LexMeta and the article, i.e.
ms:LexicalConceptualResource and frbr:Expression (again, I suggest using rdfs:subClassOf)
see above for ms:DatasetDistribution and frbr:Manifestation
for frbr:Work and dcat:DatasetSeries, my hesitation is that we are stepping at others' vocabularies. Yet, at MetaShare/LexMeta we don't have yet a class for this. We will need to introduce one - on my to-do's.

pennyl67 / LexMeta