svn2bzr reads in a Subversion dump file containing the repository's history, and converts it to a Bazaar repository according to the given parameters. For a single branch Subversion repository, the resulting revision numbers in the Bazaar repository are identical to the ones in Subversion. svn2bzr is meant as a one-time conversion tool, to be used once you've decided to switch a project's version control from Subversion to Bazaar. If you need to interact with an existing Subversion repository from within Bazaar, consider the bzr-svn plugin instead.