Class InkNode

public abstract class InkNode : Node, INode
   {
   }
Here's a more comprehensive example with methods and properties:
public abstract class InkNode : Node, INode
{
    public string Text { get; set; }
    protected void SetText(string text)
    {
        this.Text = text;
    }
}

protected InkNode(NodeType nodeType)
   {
   }