'instance:forever ref'

http://finregont.com/fro/xbrl/instance.ttl#foreverRef
Property 'instance:forever ref'

sxml:tag

http://www.xbrl.org/2003/instance#forever

rdf:type

owl:ObjectProperty

rdfs:label

forever ref

References
as rdfs:subClassOf (instance:Context period type, instance:Context period type)