© 2006 Autodesk
What’s New in Autodesk Revit Structure 4
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.NET based API only
§API based on .NET 2.0 Framework (MS DevStudio 2005)
Application Integration
§Integrated Journaling and Regression testing
§Performance improvements using Suspend update
Element Creation:
§Numerical Units type
§Model Lines
§Material Class
§Openings
Revit Building 9.1
§Expanded support for Rooms and Room tagging
Revit Structure 4
§Boundary Conditions
§Beam Systems
§Path Reinforcement and Reinforcement sets
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What's new in Revit 9.1 API
.NET:
All new API applications must be written in MS Dev Studio 2005 and .Net Framework 2.0 – Released in November of ’05.  The Revit API is not backwards compatible with MS DevStudio 2003
Application Integration:
External applications will now have the ability to add a toolbar to the Revit UI
Added the capability to run regression tests on API applications so their testing can be automated
Adding and changing data in Revit through the API has been significantly improved by suspending regeneration of the model.

New Elements:
Provided a new interface to access Model units rather than the database units which sometimes required conversion to standard units that would be familiar to users.
Ability to create model lines
A new Materials class has been created that will let developers access , change and create data related to materials, fill patterns and colors.
New Openings class provides access to openings created manually or through shafts and family based elements. Also provides the ability to create new openings.

RBD
Expanded support for accessing room information, creating rooms and adding tags to rooms

RST
Ability to access, change and delete Boundary conditions.
Ability to define beam systems
Ability to create Path reinforcement and Reinforcement sets programmatically