限る

1. Origins, structure, and basic meaning

• Structure: The godan transitive verb 限る (かぎる) restricts a target, range, or permission to stated conditions.
• Basic usage: The allowed group takes に in 市内に住む人に限る, and だけに can emphasize an exclusive limit.

2. Common pitfalls and similar expressions

• Restricting a scope
  • Here it follows a phrase naming the allowed group; this construction is distinct from the idiom 〜に限る, which recommends something as best.