What are the mapping specifications for drawings?
Mapping specification for drawings is an encoding method that allows users to create, manipulate, and define how CAD data is organized and attributed as GIS content, and it is implemented in both ArcGIS for AutoCAD and ArcGIS 9.3. Mapping specification for drawings includes a filtering criteria based on your existing CAD standards to define how your drawings should be interpreted as GIS feature classes. This method also includes the means to add a schema of attributes to any AutoCAD entity. Mapping specification for drawings is recommended by ESRI as the best practice means to share data between AutoCAD and ArcGIS using an AutoCAD file.