Postgresql extra tables

Hi !

I'm trying to generate from a postgres database (7.4.1)
Why the following tables are included and how can I exclude them ?
sql_languages
sql_packages
sql_sizing_profiles
sql_features
sql_sizing
sql_implementation_info

I use middlegen 2.1 with the driver from middlegen 
(http://boss.bekk.no/boss/middlegen/platforms/database.html says that 
official postgres driverhas bugs in the meta data implementation)

Thanks !

Pat


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