Trunk (software)
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The Trunk refers to the main release of a software package under revision control. This is a convention used by open source developers in the way that revisions and branches are numbered. There are three directories: trunk, branches, and tags. Typically, the trunk represents the most stable code, and divergent changes are made in branches.
The "Branch" column refers to the subversion (SVN) or concurrent versions system (CVS) branch name. The logic is that patch releases (R-x.y.z, z!=0) are made from the branch named "R-x-y-patches", whereas normal releases (R-x.y.0) are made from the trunk.