The Application Model consists of nodes and properties. Nodes can have child nodes and they form the structure of the Application Model. A node typically has a set of properties that hold the Application Model's data. For example, the Application Model has the IModelOptions node. This node has child nodes as well as properties that represent an XAF application's settings.
The IModelNode interface represents the Application Model's node, and exposes members to manage it. Using them, you can access the node's child nodes and properties.