How to empty XE database and re-create tables/fields from scratch?

Hi,
I've installed XE database to port my VB6/Access application to it, and I know that XE is limited to one single database, so far so good. But I want to erase everything from inside this default database to create my own tables/fields from scratch. How can I do that?
I just want to have one single database file with some tables/fields inside it, and nothing else. The rest will be done through VB straight.
And what is the name of the default XE database file? Where is it stored? If I make a backup of this file, can I restore it after a crash in the future by overwriting the corrupted file? Is that this simple as Access is?
Sorry about those many questions and thanks for reading!
Roger.

If you want to erase everything, one solution is to uninstall Oracle XE and just to reinstall it.
Under Windows to avoid any issue, see http://download.oracle.com/docs/cd/B25329_01/doc/install.102/b25143/toc.htm#CIHDDHJD.
If your application is owned by a single Oracle user account, you can also run (where <schema> is the Oracle user account name):
drop user <schema> cascade;To reinstall your application you would need to recreate the user account <schema> with the right privileges (CREATE USER ... and GRANT ...).

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