There are currently three scripts provided by the svn-buildpackage package:
svn-inject: script used to insert an existing Debian package into a Subversion repository, creating the repository layout as needed.
svn-buildpackage: exports the contents of the directory associated with the starting directory from the Subversion repository to the clean environment and build the package there.
svn-upgrade: similar to uupdate, upgrades the trunk to a new upstream version, preserving and merging Debian specific changes.