At the highest level, the FunnelWeb parser parses the input file (token list) into a sequence of text scraps, macro definitions, and typesetter directives.
input_file = {text | macro | directive}
All three of these kinds of components contribute to the documentation file, but only macro definitions contribute to the product files. If all the free text and directives were removed from a FunnelWeb input file, the product files would not be affected.