In a code such as c-fcs-98-42, c stands for conferences, fcs stands for Formalization of CommonSense reasoning, 98 stands for 1998 (but it's 1998 internally, no millenium problems!), and 42 stands for the the page number for the first page of the article in the workshop proceedings. (Though revised papers may have a different number of pages compared to the originals, we plan to keep these codes fixed anyway).