根据 All:All,Sequence:Sequence -- Recurse 规则 2 / Choice:Choice -- RecurseLax，如果派生粒子的 {particles} 中的任意粒子均未映射至某基本粒子，则此基本粒子的 {particles} 中的所有粒子应可以为空。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

All particles in the {particles} of the base particle which are not mapped to by any particle in the {particles} of the derived particle should be emptiable - All:All,Sequence:Sequence -- Recurse Rule 2 / Choice:Choice -- RecurseLax.

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