In the GEMOC project, MoCCML is dedicated to define the MoC associated with the DSMLs. The purpose of this document is to define the operational semantics of the MoCCML language and also to define the first steps of an approach to provide an exhaustive exploration of the MoCCML models. This document presents the operational semantics of the MoCCML language. The chapter is divided in several sections that present the grammar rules of the language and the operational rules mainly defined using mathematical grounds and Plotkin structural operation semantics rules. The document presents the elements that are relevant to describe the evolution of a MoCCML model as well as a draft of how exhaustive exploration is to be realized in a context using MoCCML models.