there was a sale price i believe, we'll fix it right away
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V5.5 of Substance Painter gives you the ability to author a MDL, using the nodal graph power of Substance Designer. MDL or Material Definition Language, created by Nvidia, is a language meant to describe the property of a physically based material, and how it is supposed to behave. Once you define a material with MDL, you can then use it in all the applications that supports MDL (Iray, Nvidia Mental Ray).
First of all, it’s not a shading language.
Substance Designer is the first and unique MDL editor available on the market.
Still based on the nodal system that makes the strength of SD, it empowers the user, and give him the ability to try and iterate like never before:
If you are a surface or rendering artist, you can use MDL editor to explore new patterns. If you are an existing Substance user, you can now explore new – more complex – types of materials (like multi- layered ones). You can improve the quality of your materials for your Iray renders.
Substance Designer becomes a material hub where you can create your materials for different render targets
More information about Material Definition language can be found here.