Currently I am doing a master thesis regarding geometric and parametric constraints similar to the ones that can be found in Autocad. There are a few modifications, but in general I would like to compare them with what is currently in Autocad. Could anyone point me out where those constraints are actually stored? I have searched through the DXF and DWG specs, but couldn't find the reference.
I would also like to know if constraints in Autocad are 'metainformation' along with a materilised shap