Represents a flattened hierarchy node.
| Null | Represents a flattened hierarchy node that is null or invalid. |
| ChildrenCount | The number of children nodes that the node has. |
| Depth | The depth of the node. |
| NextSiblingOffset | The offset of the next sibling of the node. |
| Node | The hierarchy node referenced. |
| ParentOffset | The offset of the parent of the node. |
| Type | The type of the hierarchy node. |
| HierarchyFlattenedNode | Creates a flattened node. |