Can't find Moment class in Photos

In the Dictionary inspector in SD looking at Photos dictionary entry for the class Media Item under Where Used is said;
element of the Moment class .
Where can I inspect the Moment class?

moment (noun) A set of media items that represents a Moment.

id: The unique ID of the Moment.
name: The name of the Moment.
Element: media item

The media items contained in this Moment
The moment class is used as element of application class

--untested with actual moments, but this could give you a start
tell application "Photos"
	set allMyMoments to every moment
 	set momentContents to media items of moment 1
end tell
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