関する

1. Origins, structure, and basic meaning

• Structure: 関する (かんする) is a verbal expression that links a preceding topic to following material as its subject matter.
• Basic usage: 歴史に関する資料 uses the dictionary-form clause to modify materials, while 安全に関して報告する adverbially presents safety as the topic of a report.

2. Common pitfalls and similar expressions

• Attributive and connective forms
  • に関する directly precedes the noun 資料, whereas に関して connects to the verb 報告した. In both, the preceding topic is marked by に.