<Vertex>
A <Vertex> is required to specify a <Location>, and is used as a component to create geometric primitives.
However, like <Polygon>, <Vertex> is very flexible and can supply more than the minimum information if desired, such as <Colour> and <Texture Coordinate> instances.
As with <Polygon>, instances of the <Vertex> class can inherit 'attribute' components, provided they can be applied to a <Vertex>. For example, a <Vertex>
- Does inherit <Colour>
- Does not inherit <Classification Data>