Using own mnesia table in ejabberd module

Hello,

I try to write simple ejabberd module with own mnesia table.

I have some questions:

1) Need i create schema for my table:

Node = node(),
mnesia:create_schema([Node])

or not?

2) when i try to create new table:

mnesia:create_table(tab,
[
{ram_copies, Node},
{type, set},
{attributes, record_info(fields, tab)}
]).


What Node i must use?

Thank you