If I have a template (say a generic letter) that is filled in with various pieces of data (say, the name of the addressee), what is a general term for those pieces of data?
For example:
Dear {firstname},
This is just a friendly reminder that the book {booktitle} will be due on {duedate}.
Thank you.
What would I refer to {firstname}
, {booktitle}
and {duedate}
as?