Passing extra information to helpers

You may find that you need to provide extra information to a helper application, such as the pathname to the site you are working on, or the current folder that the document you are using is in etc. The following special flags are available for this purpose:

Table 16-1Special flags
%fcurrent document filename, including directory
%Ucurrent document uri
%dcurrent document directory
%Scurrent site directory
%%a normal % character, should you need one