| English | eng-000 |
| Outline Processor Markup Language | |
| filename extensions | art-335 | opml |
| TechTarget file types | art-336 | OPML-Outline-Processor-Markup-Language |
| dansk | dan-000 | Outline Processor Markup Language |
| Deutsch | deu-000 | Outline Processor Markup Language |
| suomi | fin-000 | Outline Processor Markup Language |
| italiano | ita-000 | Outline Processor Markup Language |
| 日本語 | jpn-000 | アウトライン プロセッサ マークアップ言語 |
| bokmål | nob-000 | Outline Processor Markup Language |