obl:mod: oblique modifier
UD_French-Spoken, UD_French-Sequoia and UD_French-GSD use the obl:mod relation for nominal adjuncts.
They can be (but are not always) introduced by a preposition.
Here is an example from UD_French-Spoken :
oui oui je prends le métro le matin à huit heures et demie \n yes i take the underground in the morning at eight thirty
obl:mod (prends, heures)
obl:mod (prends, matin)
obl:mod in other languages: [bej] [ess] [fr] [gya] [ha] [ht] [pay] [pcm]