SGML Entity Management
Chapter 3 Location of miscellaneous files
There are a number of other files, though not entities referenced by Document
instances, are still required by the SGML subsytem to parse or validate the
document. These files are also covered by this document.
Declaration Files: Any declaration file should be put in
/usr/lib/sgml/declaration
Notations: These files go in /usr/lib/sgml/notation.