So I have:

texture {
	uv_mapping function { ...something in terms of x and y... }

	texture_map {
		[... Texture1]
		[... Texture2]
		[...etc...]
	}
}

Looking at the results, it appears that the uv_mapping transformation of
the texture coordinates doesn't just apply to the outer texture's
function; it also applies to Texture1, Texture2 etc. That is, the inner
textures are calculated in terms of (u,v) as well.

Is there a way I can get the inner textures to be calculated in terms of
(x,y,z) and only have the uv_mapping being applied when selecting a
texture from the texture_map?

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