This is very important subject. Products like Micrsostation claim superiority over ArchiCAD because their developers provides a seamless workflow from one discipline to the next without translation. Graphisoft has chosen to counter that by being a leading voice in the development of open standards for data exchange and offering very good tools for interoperability with established products and de facto standards like DWG.
That said, I too feel that GDL is the key to ArchiCAD's success or failure in the construction marketplace. I'm glad to see David join the discussion. I had forgotten about Kimon Onuma. It's a shame he doesn't participate in these forums.
A little over a year ago I saw Kimon demonstrate some GDL objects his firm had developed. One was a complete aircraft hanger as a single object. As it was resized all the components, including the structural steel skeleton, were recalculated based on pre-established rules. For example, trusses didn't just get longer, but changed entirely to handle the increased span and load. Thus a usable BOM could be generated.
That may be an extreme example. But I think it demonstrates the power of GDL, the need for more talented GDL developers, and value of promoting GDL beyond it's role as a platform for architectural accessories.
Regards,
Geoff Briggs
I & I Design, Seattle, USA
AC7-28, M1 Mac, OS 15.x
Graphisoft Insider's Panel, Beta Tester