Abstract: A method for the lightweight extension of a data model includes first loading into memory, an extension document referencing a model document in a data analytics system. The model document defines a data model and the extension document extends the data model with at least one modification to the data model. The method then includes extracting from the extension document, the modification to the data model. Finally, the method includes creating in the memory the data model from the model document combined with the modification so as to produce an extension to the data model without processing a redeclaration of a view of the data model in the extension document.