How to delete/create databases in Neo4j?

Is it possible to create/delete different databases in the graph database Neo4j like in MySQL? Or, at least, how to delete all nodes and relationships of an existing graph to get a clean setup for tests, e.g., using shell commands similar to rmrel or rm?

[yife]

データベースをまるっと消したいときは、そもそもdbファイルを消せと。