... Thomas, B. & Shaya, E. 2003, in ASP Conf. ... Brian Thomas and Edward Shaya 1 . ... We propose the beginnings of a data model for the Virtual Observatory (VO) built up from simple ``quantity'' objects. ... Recently Plante (2003) has argued for a quantity-based data model, where a quantity is used to model all of the data interactions. ... In our model, we consider that all datum in V for a given Q are "homogeneous"meaning that every datum of a given Q has the same units and data format. ... Shaya 1 ...