Standard Generalized Markup Language (SGML) harshe ne da ake amfani da shi don ayyana tsari da abun ciki na takaddun lantarki. Ma'auni ne don ma'anar harsunan ƙira, kuma ana amfani da shi don ƙirƙirar harsunan alamar don takamaiman aikace-aikace. SGML yana ba da hanya don ayyana tsarin daftarin aiki, abubuwan da aka yi alama, da dokoki don sarrafa takardu. An ƙera shi don a yi amfani da shi don manyan takardu masu rikitarwa, kuma ana amfani da su a masana'antar bugawa don ƙirƙirar takaddun fasaha, takaddun doka, da sauran nau'ikan takaddun tsari.