If you look at the metadata for a related list in a page layout, you might see something like this:
<relatedLists>
<fields>Nopulous_Gateway__c</fields>
<fields>Status__c</fields>
<fields>Surripedous_Lair__c</fields>
<fields>Contact__c</fields>
<relatedList>Slomonious_Regency__c.Flubops__c</relatedList>
</relatedLists>
However, if you are using a standard object, some objects and fields will be in all-caps and will not reflect their API Names:
<relatedLists>
<fields>TASK.SUBJECT</fields>
<fields>TASK.WHO_NAME</fields>
<fields>TASK.WHAT_NAME</fields>
<fields>ACTIVITY.TASK</fields>
<fields>TASK.DUE_DATE</fields>
<fields>TASK.STATUS</fields>
<fields>TASK.PRIORITY</fields>
<fields>CORE.USERS.FULL_NAME</fields>
<relatedList>RelatedActivityList</relatedList>
</relatedLists>
You see these same all-caps names used in report metadata.
Where are these all-caps names documented? If nowhere, what are the all-caps names that I can expect to see?