> Hi,
>
> Can I achieve a 'merge replication' between two database nodes with
> slony1?  I know that  slony1 is a master-multi slave replication system,
> but, is it possible to have two nodes, both being publisher and
> suscriber of the other?

AFAIK you can replicate one set from Node1 to Node2 and another set in 
the opposite direction. As any table can be only in one set at a time this
means that each table can have only one master.

> Thanks in advance.
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