Describes a pre-defined method to solve a conflict or act in
a particular situation, inside a 2 or 3-way merge.
Note that this actions indicates a purpose, not an
act. For example, if the action indicate to copy left
object to right, but right item is in fact identical
to left item, the copy will not happen.
Use automatic merge, i.e., follow logical rules to
Copy the data from that side, if an object is here,
do nothing if it is absent
Ingore this item
Copy the data from left or right, using the first
Keep the least recent amongst left and right
Copy the data from that side if an object is present,
else remove data from output
Keep the most recent amongst left and right