“There was some difficulty in times gone by against obtaining relief against persons unknown, but over the years that problem has been remedied either by statute or by rule.”
“A trespasser may in any case be turned off land before he has gained possession, and he does not gain possession until there has been something like acquiescence in the physical fact of his occupation on the part of the rightful owner.”
“(a) ‘a possession claim’ means a claim for the recovery of possession of land (including buildings or parts of buildings); (b) ‘a possession claim against trespassers’ means a claim for the recovery of land which the claimant alleges is occupied only by a person or persons who entered or remained on the land without the consent of a person entitled to possession of that land but does not include a claim against a tenant or sub-tenant whether his tenancy has been terminated or not; …”