Must start the session and return a unique id or false.
_getTableNames()
Must be rewrited or the table will be "Usuario" for default.
Check if this is a valid session, return a boolean value (1=>success).
End this session
Return a true value if this user have access to this uri false if not.
Return a true value if this group have access to this uri false if not.
Grant user the access to uri.
Grant group the access to uri.
Make the uri denied to the user
Make the uri denied to the group
return an array with the available uri