PossNumber: possessor’s number
Possessives may have two different numbers: that of the possessed object (number agreement with modified noun) and that of the possessor. The PossNumber feature captures the possessor’s number. For simplicity, the set of possible values is identical to Number, although only a subset has been observed in corpora so far.
Sing: singular possessor
Examples: [en] my, his, her, its; [cs] můj pes (my dog; PossNumber=Sing|Number=Sing); mí psi (my dogs; PossNumber=Sing|Number=Plur).
Plur: plural possessor
Examples: [en] our, their; [cs] náš pes (our dog; PossNumber=Plur|Number=Sing); naši psi (our dogs; PossNumber=Plur|Number=Plur).