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### 9.3 Package hierarchy

Packages installed in `$INSTALL_DIR/include/polyorb/moma` hold the MOMA API. MOMA is built around two distinct sets of packages:

1. `MOMA.*` hold the public MOMA library, all the constructs the user may use.
2. `POLYORB.MOMA_P.*` hold the private MOMA library, these packages shall not be used when building your application.