In computing, Document Type Definition; a set of rules that defines the legal elements and structure of an XML or SGML document.
Acronym from 'Document Type Definition,' a term coined in the 1980s-1990s as computer scientists developed ways to standardize how documents are marked up and structured in digital systems.
DTDs are like grammar rules for computer files—they tell a machine exactly what elements are allowed, in what order, and with what properties, so that different computers can understand each other's documents without confusion.
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