olemus
UML: element, mis sisaldab klassi malli formaalsete parameetrite väärtusi
= a templateable element that contains bindings to templates

ülevaateid
https://www.cs.cornell.edu/courses/cs211/2000fa/materials/UML-Class-Notation-Guide.pdf (subsection 4.9)
https://www.math.unipd.it/~tullio/IS-2/Guida_Notazioni_UML-14.pdf (subsection 3.31)
https://www.omg.org/spec/UML/2.5/Beta1/PDF/