Tags, branches, and the trunk are all the same to subversion; they are simply copies. To tag in subversion is to perform the same operation as creating a branch: svn copy. The difference between a tag and a branch is a semantic one. Branches are used for ongoing development. Tags are considered static snapshots.
in reply to Re^2: [OT] Best Use of Subversion Branches in Perl Development
in thread [OT] Best Use of Subversion Branches in Perl Development
What is being suggested is that you create periodic snapshots of the trunk -- that way you don't have to remember the revision number of the previous time you merged in changes from the trunk; you simply remember the tag names.