Pruning a medlar is not essential as it is with other fruiting trees. You can thin branches to let more light into the center of the tree and remove dead wood, but that is generally all that is needed.
Your English is incorrect, should read, "How do you prune an olive tree?"
grafting
I'm not sure what abjacent means. Could you have meant adjacent? That means beside, or next to. Here are some dictionary definitions of medlar: http://dictionary.reference.com/browse/medlar ... looks like it is a small tree or bush. However, if medlar was intentionally capitalized as in a proper noun, then I don't know.
You can prune it but the symmetrical shape that makes it attractive will be wrecked. If you do prune only tip prune.
If you wanted to prune a tree, you will need a Class 1 fulcrum.
prune them
Martin Medlar died in 1965.
Martin Medlar was born in 1899.
winter
During the Winter.
I have no idea.=D
early spring