MIL-PRF-28001C, PERFORMANCE SPECIFICATION MARKUP REQUIREMENTS AND GENERIC STYLE SPECIFICATION FOR EXCHANGE OF TEXT AND ITS PRESENTATION (2 MAY 1997)., To set forth the overall requirements for the creation and management of Standard Generalized Markup Language (SGML) applications. This specification defines performance characteristics for the following SGML applications: a. Document type declaration. b. Document Type Definition (DTD). c. Document instance. d. Formatting Output Specification Instance (FOSI).