> Is there any way to have incremental primary keys without the 
> explicit usage of sequences? If yes, how?

What do you mean by implicit use of sequences?

> What can I win with a unknown-pk declaration?

There is a paragraph in the spec about it called Special case Unknown
primary keys.

> Is there any way to automatically create the sequences if 
> they don't still exist (something like: @jboss:create-table 
> create="true")?

At the moment, JBoss does not create sequences even if it is setup to
create tables. As a workaround, I think, you could use something like
@jboss.persistence post-table-create="CREATE SEQUENCE %%t_seq START WITH
1 INCREMENT BY 1"



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