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OVF uses DMTF's common information model, or CIM standard. The main website for  https://www.dmtf.org/standards/cim/. The DMTF issues new versions periodically. 

Hypervisors have their own lists of supported operating systems , for based on specific versions of the CIM standard. For example, VMware has the VirtualMachineGuestOsIdentifier, which you can find in the VMware documentation.

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The following values are set in the Operating System Section of the OVF file or the OVA.

The "ovf:id" is an identifier from the CIM standard. You can find it in the CIM_OperatingSystem.mof file of the CIM standard.

Code Block
  <VirtualSystem ovf:id="vm">
    <Info>A virtual machine</Info>
    <Name>WinDev1810Eval</Name>
    <OperatingSystemSection ovf:id="121" vmw:osType="windows9_64Guest">
      <Info>The kind of installed guest operating system</Info>
    </OperatingSystemSection>

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