Looking for the edifact_serviceschema.xsd

Hi

I am looking for the edifact_serviceschema.xsd which is used by Edifact_ContrlSchema.xsd found at github:

https://github.com/microsoft/Integration/blob/master/BizTalk%20Server/Schema/EDIFACT/Edifact_ContrlSchema.xsd

Is it closed source? Or can it be found elsewhere?
Sorry I do no longer have access to BTS or similar ressources but I'd like to use the control / service schemas for a private data validating and conversion project of my own

Thanks /Peter