Definition :
Object-relational mapping in computer science is a programming technique for converting data between incompatible type systems using object-oriented programming languages. This creates, in effect, a “virtual object database” that can be used from within the programming language.
Further Reading :
Book : Applying UML and Patterns by Craig Larman.
Definition:
A Petri net, also known as a place/transition net, is one of several mathematical modeling languages for the description of distributed systems. It is a class of discrete event dynamic system. A Petri net is a directed bipartite graph, in which the nodes represent transitions and places.
Further Reading:
Book : Applying UML and Patterns by Craig Larman.
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