Formal language theory, introduced by Noam Chomsky in the 1950s as a tool for a
description of natural languages [8–10], has also been widely involved in modeling and …

This paper introduces a new variant of Petri net controlled grammars, namely a concurrently
controlled grammar, where the control over the application of the productions of a grammar …

A place-labeled Petri net (pPN) controlled grammar is a context-free grammar equipped with
a Petri net and 7 a function which maps places of the net to the productions of the grammar …