[Tools] Trouble understanding a building block in FrameMaker

[Rahul Prabhakar]

This query is for all the FrameMaker gurus on the list.

I am having trouble understanding one of the building blocks used in
FrameMaker: *<$paratext[+,paratag]>*

Can anyone illustrate the function of this building block?

Best,
Rahul Prabhakar