The research work presented here is articulated around the fields of architectural documentation and geometrical
modeling. It concerns the definition of an informative system on an architectural scale which exploits the relations
between the 3D representation of the building (shape, dimensions, state of conservation, hypothetical restitution
of its transformations in time) and heterogeneous information coming from the various fields (technical, documentary,
historical) which take part in its understanding. The described approach aims at organizing multiple
representations (and associated information) around a model of semantic description with the aim of defining a
system for the multi-field observation of the building. The principles studied are implemented in aWeb Application,
whose main functionalities we present.