Include:
Simple Assignment
Lookups (Different methods for doing a lookup - codemap, api, db)
Handling optional and repeating segments - https://help.interfaceware.com/v6/eliots-tips-and-tricks#segments
mapTree and mapRange for HL7
Converting between different message types. For example, between different HL7 messages where each segment should be its own function, similar to what MD Anderson does.