  In this project we are presenting a grammar which unify the design and
development of spatial databases. In order to make it, we combine nominal and
spatial information, the former is represented by the relational model and
latter by a modification of the same model. The modification lets to represent
spatial data structures (as Quadtrees, Octrees, etc.) in a integrated way. This
grammar is important because with it we can create tools to build systems that
combine spatial-nominal characteristics such as Geographical Information
Systems (GIS), Hypermedia Systems, Computed Aided Design Systems (CAD), and so
on
