Computer method and apparatus implements redefinition of features in a programming model. The invention method includes (i) providing a model element having a feature with a redefinition such that the feature is a redefined feature; (ii) storing indications of the redefinition; and (iii) interpreting the stored indications and generating therefrom a model that implements the redefined feature. Redefined features include redefined property names, redefined property type and redefined multiplicity of a property.