Questions About CompositionEditionID.

The CompositionEditionID is the edition upon which your current edition is derived from/based on.
Your composition edition is the edition "above" in the hierarchy.

Here's all the composition editions and their "children":

• Core is the base of Core and CoreSingleLanguage
• CoreN is the base of CoreN
• CoreCountrySpecific is the base of CoreCountrySpecific
• Enterprise is the base of Pro, Pro for Workstations, Education
• EnterpriseN is the base of EnterpriseN, Pro for Workstations N, EducationN
• EnterpriseEval is the base of EnterpriseEval
• EnterpriseNEval is the base of EnterpriseNEval
• EnterpriseG is the base of EnterpriseG
• EnterpriseS is the base of EnterpriseS
• EnterpriseSN is the base of EnterpriseSN

Example:
Enterprise has all features enabled and its children will be (regarding the amount of features) identical (like Education) or 'inferior' (like Pro/ProWS). Same applies to all others.

There's more where that came from but that's the simplest way to put it. If you want a more in-depth explanation feel free to ask.

It's more of a parent-child relation. They are not subdivided as the composition edition is not a "special category of editions" but rather just an edition that is higher in the hierarchy.

In the case of Pro and Enterprise:
Enterprise is a virtual edition based on Pro. Virtual editions are editions that have no upgrade behavior in relation to their parent (you don't need to change anything in the system) and you can switch to them simply by installing the appropriate key.

Downgrades are not allowed.

The N variants are separate.

 

I'll elaborate on that so it's hopefully easier to understand when I have some free time later today.
In the meantime if you have any questions feel free to ask.

 

C:\Windows\servicing\Editions\EditionMappings.xml

 

What's that? For me,

Code:

Start-Process "$Env:SystemDrive\Windows\servicing\Editions\EditionMappings.xml"

shows:

Code:

<?xml version="1.0" encoding="utf-8"?>
<WindowsEditions xmlns:e="urn:schemas-microsoft-com:windows:editions:v1">
    <Edition virtual="true">
        <Name>Education</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>EducationN</Name>
        <ParentEdition>ProfessionalN</ParentEdition>
    </Edition>
    <Edition>
        <Name>EnterpriseS</Name>
    </Edition>
    <Edition>
        <Name>EnterpriseSEval</Name>
    </Edition>
    <Edition>
        <Name>EnterpriseSN</Name>
    </Edition>
    <Edition>
        <Name>EnterpriseSNEval</Name>
    </Edition>
    <Edition virtual="true">
        <Name>IoTEnterpriseS</Name>
        <ParentEdition>EnterpriseS</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>IoTEnterpriseSEval</Name>
        <ParentEdition>EnterpriseSEval</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>IoTEnterpriseSK</Name>
        <ParentEdition>EnterpriseS</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalCountrySpecific</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalEducation</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalEducationN</Name>
        <ParentEdition>ProfessionalN</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalSingleLanguage</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalWorkstation</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ProfessionalWorkstationN</Name>
        <ParentEdition>ProfessionalN</ParentEdition>
    </Edition>
    <Edition>
        <Name>CoreCountrySpecific</Name>
    </Edition>
    <Edition>
        <Name>Starter</Name>
    </Edition>
    <Edition>
        <Name>StarterN</Name>
    </Edition>
    <Edition>
        <Name>EnterpriseGN</Name>
    </Edition>
    <Edition virtual="true">
        <Name>EnterpriseN</Name>
        <ParentEdition>ProfessionalN</ParentEdition>
    </Edition>
    <Edition>
        <Name>EnterpriseNEval</Name>
    </Edition>
    <Edition virtual="true">
        <Name>CoreSingleLanguage</Name>
        <ParentEdition>Core</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>Enterprise</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition>
        <Name>EnterpriseG</Name>
    </Edition>
    <Edition virtual="true">
        <Name>IoTEnterprise</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>IoTEnterpriseK</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition virtual="true">
        <Name>ServerRdsh</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition>
        <Name>EnterpriseEval</Name>
    </Edition>
    <Edition>
        <Name>Core</Name>
    </Edition>
    <Edition>
        <Name>CoreN</Name>
    </Edition>
    <Edition virtual="true">
        <Name>CloudEditionN</Name>
        <ParentEdition>ProfessionalN</ParentEdition>
    </Edition>
    <Edition>
        <Name>ProfessionalN</Name>
    </Edition>
    <Edition virtual="true">
        <Name>CloudEdition</Name>
        <ParentEdition>Professional</ParentEdition>
    </Edition>
    <Edition>
        <Name>Professional</Name>
    </Edition>
    <Edition>
        <Name>WNC</Name>
    </Edition>
</WindowsEditions>