noun
declaration subset
Technical term in computing, specifically in SGML/XML contexts, referring to the part of a document type definition that contains markup declarations.
SGMLでは、宣言部分集合に要素型宣言や属性リスト宣言が含まれる。
In SGML, the declaration subset includes element type declarations and attribute list declarations.
Compound of 宣言 (declaration) + 部分 (part) + 集合 (set), a direct translation of the English computing term 'declaration subset'.