Repository: A physical subversion repository.
Depot: A short name that maps to the real repository. For example, the svk depot "" (empty string) maps to the real repository '~/.svk/local'. The empty-string depot is also referred as default depot.
Resource: A Resource is a file, directory or special node (such as symlink), that is versioned by svk.
Depotpath: A versioned Resource in the specified Depot and path. For example, '//foo' refers to path "/foo" in the depot "" (empty string)
Mirror: A Depotpath which is linked to and may be synchronised with an external repository. This repository may be remote and may be hosted in a different versioning system. The entire state of the remote repository (throughout its entire lifetime??) is represented locally for full disconnected operation.
Revision: In svk, a Revision is the state at a point in time of the entire tree in the repository.
Change: A change represents the difference between the contents of the depot in two subsequent Revisions. A change is also a tree delta.
Change N: Changes refered to numerically correspond to the difference between Revision N - 1 and Revision N.
Editor: An API in subversion describing tree delta between revisions.
Tree Delta: Differences between two trees.