I've been given a task to write a GIS (Shapefile .shp) rendering application.
The document and shapefile technical specification states that 3D shapefiles exist. The document also mentions that a single shapefile can have multiple layers, although the technical specification does not describe this.
I was not given sample files for either of these cases so I can't do anything. I've been looking all over google, but I cannot find any sample 3D or multi-layered shapefiles. Does anyone have, or know where I can find such files?