Document set
A document set is a
specialized folder, meant to facilitate the management of a great number of
documents that need to be continually revised and periodically published. An
application example is the management of all HTML documents of a website.
Document sets typically contain templates, sets of text variables and other
document sets (to allow for hierarchical structuring). Document set folders
feature an 
action that produces the current documents from the templates and the values of
the text variables.