Resource for HCM field definitions

Summary

Online resource for looking up definitions at the field level

Content

Good afternoon.

I am able to find online resources on HCM Subject areas, Folders and Tables.  I can't locate a place to go to find definitions at the field level.  For example, in the "Workforce Management - Worker Assignment Event Real Time" Subject Area and "Worker" folder, there is a field named "Person Hire Date".  I need to know what action types go into this field (does it include an employee that was either Hired, Rehired or Added or not all of these?).  So, I'd like to find field-level definitions.