Yes, there are many different scenarios, and ways to handle them. When I'm approaching an apparently unaware or squirrelly individual/group from behind, I take the centre of the path and call out "coming through" from as far back as I expect them to be able to hear me; and I repeat the announcement until they have noticed and reacted or I have passed them. When I'm approaching from the centre, it is their decision on which side they choose to yield some space; I'm not imposing any expectations about which part of the path they should yield to me. When it's a group, they also have the option to clear in both directions and leave the centre open. Have not had any accidents, near misses, or angry responses with this approach, so far.