I've never noticed before but the drop down for an If action (at least with System Clipboard selected) has an item labelled "conforms to". How do I use this?

I've never noticed before but the drop down for an If action (at least with System Clipboard selected) has an item labelled "conforms to". How do I use this?
From the condition:Clipboard wiki page:
has some flavor that conforms to the specified Uniform Type Identifier.
Basically a way of checking if the clipboard conforms to a UTI you provide as the match, i.e. public.image. Note that this is my interpretation of what I read; I've never used that conditional test :).
-rob.