noun
document type declaration
Computing term for the declaration at the beginning of an SGML or XML document that specifies its DTD or schema.
HTML文書の先頭には文書型宣言を記述します。
A document type declaration is written at the beginning of an HTML document.
Compound of 文書 (document), 型 (type), and 宣言 (declaration). A calque of English 'document type declaration'.