Hierarchical high level fuzzy Petri nets-an enhancement through place substitution

This paper presents an additional type of hierarchical construct in the hierarchical high level fuzzy Petri net, namely the substitution of places. The hierarchical high level fuzzy Petri net was introduced before as a tool suited to compositional modeling of fuzzy knowledge, using the substitution of transition. The modeling tool capabilities are now augmented through the proposal of using substitution of places as a different focus on the application of the hierarchical concept on the topic of fuzzy knowledge bases development. The hierarchical HLFPN concept is briefly reviewed, together with the definition of substitution of transitions. The substitution of places is then described as an alternative modeling construct, that allows the knowledge base to be described in different levels of abstraction