The International Standards Organization standard ISO/IEC 10179:1996 – Information technology — Processing languages — Document Style Semantics and Specification Language (DSSSL) specifies the processing of valid Standard Generalized Markup Language (SGML) documents. DSSSL defines the semantics, syntax, and processing model of languages for the specification of documentation processing. Provides means for externalization of style characteristics and other techniques for associating style information with an SGML document.