Science and Education Publishing American Journal of Systems and Software 2372-7071 3 4 2015 08 26 Syntactic and Semantic Relationships in Models of Complex Systems: An Ecological Case 73 82 EN José Luis Usó-Doménech Josué-Antonio Nescolarde-Selva Department of Applied Mathematics, University of Alicante, Alicante, Spain Miguel Lloret-Climent AJSS2015341 10.12691/ajss-3-4-1 2015 06 17 2015 07 15 2015 08 26 In this paper, the authors extend and generalize the methodology based on the dynamics of systems with the use of differential equations as equations of state, allowing that first order transformed functions not only apply to the primitive or original variables, but also doing so to more complex expressions derived from them, and extending the rules that determine the generation of transformed superior to zero order (variable or primitive). Also, it is demonstrated that for all models of complex reality, there exists a complex model from the syntactic and semantic point of view. The theory is exemplified with a concrete model: MARIOLA model.