Clarification on payupdate atom feed

Summary:

Need clarification on Atom feed content type of - payupdate Atom feed

Content (required):

In the payupdate Atom feed I see LSED, LSPD, FINC - What do these mean exactly?

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Code Snippet (add any code snippets that support your topic, if applicable):

 <content type="text">

            <![CDATA[{"Context": [ { "PersonId": "300000053818367", "AssignmentId": "300000186591859", "PersonName": "XXXXXXXX", "EffectiveStartDate": "2022-07-11",  "EffectiveDate": "2023-04-06",  "PayrollId": "300000011081054"} ], "Changed Attributes" : [{  "LSED": { "Old" : "", "New" : "2023-04-05" }, "LSPD": { "Old" : "", "New" : "2023-04-05" },"FINC": { "Old" : "", "New" : "4712-12-31" } }] }]]>

        </content>