NodeImpl node = (NodeImpl)sessionMaryWS1.getRootNode().getNode("MARY-ReadWrite");
node.addMixin("mix:versionable");
sessionMaryWS1.save();
node.checkin();
node.checkout();
Version version = node.getVersionHistory().getVersion("1");
version.getPredecessors();
version.getSuccessors();
version.getContainingHistory();