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Document type definition
[ar] تعريف نوع المستند
[ca] Document Type Definition
[cs] Document Type Definition
[de] Dokumenttypdefinition
[eo] Dokumento-Speco-Difino
[es] Definición de tipo de documento
[et] Dokumendi tüübi definitsioon
[fa] تعریف نوع سند
[fi] DTD
[fr] Document type definition