Hi Rick,
The closest I can provide are the 38784C DTD, FOSI, and demo SGML file from Arbortext's distributed files many years ago.
BTW: If you are working with FOSI, check out my book Practical FOSI, which is for sale at http://www.FOSIexpert.com/Practical-FOSI.html, and my FOSI QuickStart Tutorials, which are for sale athttp://www.FOSIexpert.com/tutorials.html. Note that if you purchase the tutorials, you qualify for a discounted price for the book.
Good luck!
Suzanne Napoleon
"WYSIWYG is last-century technology!"