EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_CD_REGION_PERSISTENT

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
enum EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_CD_REGION_PERSISTENT = GUID(0x08018188, 0x42CD, 0xBB48, 0x10, 0x0F, 0x53, 0x87, 0xD5, 0x3D, 0xED, 0x3D);

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