sharing data accross several databases - Mailing list pgsql-sql

Hi,

I am designing 2 databases :
- the 1st relates to flasks
- the 2nd relates to cylinders

Both flasks and cylinders will be shipped accross the 
world and I need to keep track of check out dates, 
shipping method, destination, etc. These data will be of 
the same type for both databases.

Questions :
-----------
1) Is a 3rd database the solution ?
2) I would like to keep on using foreign keys (e.g. 
between a shipped item and the destination location)

Thanks for help.

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