Re: this previous post:
Al Stone of Red Hat published an updated version of 3 documents giving guidance on using _DSD ACPI:
[RFC DSD v3 00/04] How to Use the ACPI _DSD Device Properties UUIDs
A copy of the ChangeLog is also attached so that you can see what the primary changes were for this second version.
Click to access _DSD-device-properties-UUID.pdf
Click to access _DSD-hierarchical-data-extension-UUID-v1.pdf