Declarative modeling of a neurulation-like process

We propose in this paper a presentation of the MGS language and its main contributions. We show that various topological collections can be unified using concepts developed in combinatorial algebraic topology: cellular complexes and topological chains. Then we apply the notions brought by MGS to model and simulate the first step towards the simulation of the neurulation process in developmental biology where a sheet of cells evolves to a neural tube. It is a direct description of the modification of the topology of an arbitrary structure expressed in terms of local discrete evolution laws.