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How is user mapping achieved during migration from MKS to SVN using svn-importer?
/**
     * create a new SVN revision based on MksCommit
     * @param commit MksCommit object used to construct SVN revision
     */
private void createSvnRevision(MksCommit commit) {
    svnModel.createNewRevision(commit.getAuthor(), commit.getDate(), commit.getMessage());
    svnModel.getCurRevision().getProperties().set("MKSRevisionNumbers", commit.joinRevisionNumbers());
}