I saw a demonstration of a route-builder at the recent OSGIS/MUM3
conference - by http://www.camptocamp.com/ if I remember correctly.
Its basically a postgis plugin for doing route building. If you wanted
to do this quick-and-dirty, you could try to make a datastore that
returns the actual route geometries back for a request.
A perhaps better (but more complex way) would be to make a service that
does the same thing - either returning an image (ie WMS response) or a
set of features (ie. a WFS response).
As Gabriel says, there's a spec for doing this...
dave
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