is used by the DTD's which come with &sdc; to find definitions for the SGML entities related to the author. These two are &authent;. It may define some more. But these are used to insert default values for the name and the institution of the author. Therefore it's a good idea to set the environment variable ~/.typesetrc if any, is loaded after startup and comand line evaluation. It might contain any scheme code. &sdc; uses the files and directory structure in its library to parse the document and determine the formatting. For a descrition of this refer to the developers documentation. Furthermore sdc uses the