特とく定てい文も字じデータ実じっ体たい

Meanings

1

specific character data entity

Technical computing term used in markup languages like SGML/XML to define a character entity that maps to a specific character or string.

SGMLでは、特とく定てい文も字じデータ実じっ体たいを使つかって特とく殊しゅ文も字じを表ひょう現げんする。
In SGML, specific character data entities are used to represent special characters.