Richter, DieterA.A.G. Requicha2015-09-292015-09-2919861017-4656https://doi.org/10.2312/eg.19861027It can be observed that existing product data interfaces are constructed by a pragmatic manner. It is not seen any theoretical approach neither for describing nor for evaluating models. In this paper an algebraic approach based on heterogeneous algebras is presented.10.2312/eg.19861027