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Improvements in the IFC R2.0 documentation
NOTE: Some parts of the documentation have been removed, but contents of the documentation has otherwise not been changed.

• The format of the attribute table for classes has been changed.
  • It now includes information about INV, DER and SELF
  • Min, Max and Default have been removed
• The Rule definition table now include both semantic definition and the code for the rule.
• Previously only a removed attribute did not create a link from the documentation to the Migration Guide. This has been fixed, see e.g. IfcWall.
• Tables for SELECT and ENUMERATION values look nicer
• Links from Classes to their common PropertySets have been established, even if the Class does not have an PreDefinedType attribute and the associated enumeration. See e.g. IfcDoor and IfcWall
• The format of the attribute table for the fully attributed view has been changed.
  • It now includes information about INV, DER and SELF
  • Min, Max and Default have been removed
  • Redeclared attributes now appear in the right place. The attribute appears both in the subclass and the superclass, in the superclass the attribute appears grayed out.
• A 'Exchange file structure' section has been added to the fully attributed view. This table shows the attributes which can be found in an Part21 exchange file.
• IDL definitions and all liks to IDL definitions have been removed 
• The layout of the 'Superclasses and Subclasses' section has been changed.
• The object names in the Geometry use sections are now liks to the object's definition.
• The layout of the PropertySet 'attribute' table has changed (Min, Max and Default removed).
• Redundant HISTORY information removed, issues moved under the History section
• The 'Type driven PropertySets' section now shows the Pset nesting for each type. See IfcFlowEquipment as one of the best examples

I made these changes to the documentation after using the documentation for implementation purposes. I hope the improvements will also make your implementation work a little bit easier.

- Jiri Hietanen 26.10.1999