start time (P580): time an entity begins to exist or a statement starts being valid
end time (P582): moment when an entity ceases to exist or a statement stops being valid
end cause (P1534): qualifier to use together with the end date qualifier (P582) to specify the cause
direction relative to location (P654): qualifier for geographical locations to express the direction relative to the object (for direction to the subject, see P560)
symmetric constraint (Q21510862): type of constraint for Wikidata properties: used to specify that the referenced entity should also link back to this entity
contemporary constraint (Q25796498): type of constraint for Wikidata properties: used to specify that the subject and the object have to coincide or coexist at some point of history
shares border with (P47): countries or administrative subdivisions, of equal level, that this item borders, either by land or water. A single common point is enough.edit
