http://finregont.com/fro/xbrl/instance.ttl#ContextPeriodType
Class 'instance:Context period type'

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

owl:Class

The type for the period element, used to describe the reporting date info.

Context period type

owl:Thing

instance:forever ref max 1

instance:start date max 1

instance:end date max 1

instance:forever ref only instance:Context period type-forever

instance:end date only instance:Date union datatype

instance:instant max 1

instance:instant only instance:Date union datatype

instance:start date only instance:Date union datatype