So the material structure would be like this:
A&D material Gradient (Diffuse Color) Checker (Gradient Color #1) Noise (Checker Color #1)
Your Shader element is rendered to an image file.
The following illustration shows the example described in the preceding procedure. The left-hand image shows the full material, with the Noise inside the Checker inside the Gradient, and the right-hand image shows a Shader element containing only the Noise inside the Checker. The element renders the entire Checker map even though only part of it is used by the Gradient map.
Left: Full rendering
Right: Shader element