© 2010 Autodesk
Introduction to the Navisworks 2011 .NET API
Object Properties
Autodesk.Navisworks.Api.PropertyCategory
Autodesk.Navisworks.Api.DataProperty
[ModelItem]----[PropertyCategory], [PropertyCategory]----[DataProperty].png
The two main classes. Each has an associated collection class too.
The UML shows the relationship between these classes and the ModelItem.