GCE - G Core System Abstract: Everything in the world is represented by elements. An element consists of energy, form and agents. Energy characterises the element, the form defines the geometry and the agents make up the behaviour. Through some additional attributes the core system allows hierarchical structuring of elemets, element type definitions and linking of elements through connections. All laws (physical or other) that apply for an element are provided by the agents. The core system tries to provide a flexible abstraction of world content which still allows for automation of dependencies and valid influencing. Thus it should be possible to create realistic and dynamic world simulations of any kind with a wide variety of elements.