A small prototype for the "Semantic Models" draft: http://arigo.tunes.org/semantic_models.html mimages.py depends on quite a few Unix tools. The point is that it could be extended to depend on even more of those, but then only register the corresponding operations for the actually installed tools. Provided there is a way to do the requested operation, the inference engine will then find it. Also note that mmini.py has a different simpler model for images, and mboth.py contains links between the two of them. Nothing like what I'm dreaming about -- there is still no real inter-model links, but that's a start! Armin