Is it possible to add support for new database type in Data Modeler?

Hi,

I see that Data Modeler v.4 supports different versions of Oracle, DB2 and MS SQL. Is it possible to add support for a new database family,

PostgreSQL for example? I hoped that RDBMS Site editor can do it, but so far I don't see any possibility to add XML files with metadata for a new RDBMS.

I did it previously for PowerDesigner were it is possible to add and modify definitions for new relational databases.

Thank you,

Sergei