<Models> Used in the World
In practice, <Models> tend to appear in one of 2 flavors
- those that appear only in the <Model Library>, because they represent things that usually won’t be chained down to a single physical location by the end user, e.g. vehicles, people
- those that represent relatively stationary things, e.g. trees, bridges, buildings
We will introduce a second <Model>, more suitable to being instanced within an <Environment Root>.