parameter entity
Technical computing term used in contexts such as XML or SGML to refer to a named entity that can be referenced in a DTD.
In an XML DTD, parameter entities can be used to reuse markup fragments.
実体 means 'entity' in a general sense, while 引数実体 specifically refers to a parameter entity in computing.
引数 means 'argument' or 'parameter' in programming; 引数実体 is a compound that narrows this to a parameter entity in markup contexts.
parameter entity reference
Compound of 引数 (parameter) and 実体 (entity), likely a direct translation of the English computing term 'parameter entity'.