yalc:PrefixDeclaration
https://triplydb.com/Triply/yalc/vocab/PrefixDeclaration
rdfs:comment
http://www.w3.org/2000/01/rdf-schema#comment
A declaration that assigns an ...... used to abbreviate long IRIs.
@en
graph:vocab
https://triplydb.com/Triply/yalc/graphs/vocab