I propose to add a new property "active in period" with range E4 Period. The domain should include E39 Actor and E41 Appellation, so I think should be E77 Persistent Item. If it's judged that such property cannot be defined meaningfully for E77, then could be split to two proeperties for E39 and E41.
Reasons: 1. E39 Actor: BM has a field "period of activity of the actor". We currently model this as "was present at" a "fake" Event, but P12 doesn't quite say what we need: <person-institution/144526> P12i_was_present_at <person-institution/144526/activity/1>; <person-institution/144526/activity/1>P4_has_time-span <person-institution/144526/activity/1/date>. <person-institution/144526/activity/1/date> P82a_begin_of_the_begin "1859"; P82b_end_of_the_end "1900". 2. E41 Appellation: BM tracks temporal validity of person names. - One solution is described in email "ISSUE: P37, P38, P48 should be moved up to Appellation": <person/name> a E82_Actor_Appellation; P37i_was_assigned_by <person/name/assigned>; P38i_was_deassigned_by <person/name/deassigned>. <person/name/assigned> a E15_Appellation_Assignment; P4_has_time-span <person/name/assigned/date>. <person/name/assigned/date> a E52_Time-Span; P82_at_some_time_within "1600". <person/name/deassigned> a E15_Appellation_Assignment; P4_has_time-span <person/name/deassigned/date>. <person/name/deassigned/date> a E52_Time-Span; P82_at_some_time_within "1850". - But "active in period" would be a much better solution, since it also allows you to specify the cultural period through which the name was used: <person/name> a E82_Actor_Appellation; P200_active_in_period <period/medieval-france>. <period/medieval-france> a E4_Period; P3_has_note "Medieval France"; P7_took_place_at <place/France>; P4_has_time-span <period/medieval-france/dates>. <period/medieval-france/dates> P82a_begin_of_the_begin "1100"; P82b_end_of_the_end "1650".
