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; Generalization-specialization and inheritance : These are structural relations which provide for abstracting any number of objects or process classes into superclasses, and assigning attributes of superclasses to subordinate classes.
# ''Generalization-specialization link''
# ''Inheritance through specialization''
# ''Specialization restriction through discriminating attribute'': A subset of the possible values of an inherited attribute may restrict the specialization. [[File:OPM Fundamental structural relations and link.png|thumb|upright=1.5|OPM fundamental structural relations and links]]
; Classification-instantiation and system execution
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