Object Hierarchy | Related C++ Class: ProjectItem
The ProjectItem interface represents the base content object in Softimage from which all other content objects derive. Its major feature is that it provides access to the Parameters which represent the state of the object.
Almost every object in Softimage supports this interface, for example X3DObject, Property, Shader, Operator, and Primitive. The only objects that do not support this are lightweight objects like Particle, Point, Geometry and Parameter; or objects that are not content related such as Command, XSIApplication and XSIUtils.
Autodesk Softimage 2011