Source : Free On-Line Dictionary of Computing

HyTime
     
        Hypermedia/Time-based Structuring Language: an emerging
        ANSI/ISO Standard from the {SGML} Users' Group's Special
        Interest Group on Hypertext and Multimedia (SIGhyper).  A
        hypermedia extension of {SGML}.
     
        ["The HyTime Hypermedia/Time-based Document Structuring
        Language", S. Newcomb et al, CACM 34(11):67-83 (Nov 1991)].