olemus
Wiktionary:
1 (architecture) the face of a building, especially the front view or elevation
2 (by extension) the face or front (most visible side) of any other thing, such as an organ
4 (programming) an object serving as a simplified interface to a larger body of code, as in the facade pattern

UML:
stereotüüpne pakett, mis sisaldab ainult viiteid teise paketi mudelielementidele; kasutatakse paketi mõningase sisu "avaliku vaate" esituseks
= A stereotyped package containing only references to model elements owned by another package.
It is used to provide a ‘public view’ of some of the contents of a package.