OPML vs Markdown: XML Outline & Feed Standard vs Human-Readable Knowledge Text
Compare OPML (Outline Processor Markup Language) and Markdown. Explore RSS feed subscriptions, hierarchical mindmaps, task outlines, and personal knowledge management workflows.
OPML is an XML specification established by Dave Winer for exchanging hierarchical outlines, RSS/Atom subscription directories, and podcast feeds. Markdown is a human-readable plain-text formatting syntax that has become the ubiquitous standard for notes, documentation, and personal knowledge management (PKM).
| FEATURE | OPML | MARKDOWN |
|---|---|---|
| Syntax Paradigm | Structured XML tags (<outline text='...'>) | Plain-text punctuation (- item, # heading) |
| RSS/Feed Interchange | De-facto industry standard for subscriptions | Requires tabular or list formatting |
| Human Readability | Cluttered by XML attributes and entities | Maximum readability and clarity |
| PKM Tool Support | Limited to outliners and feed aggregators | Universal support across all note platforms |
| Task Checklists | Custom attributes (_status='checked') | Standard GFM - [ ] / - [x] task lists |
- Native import/export format for virtually all RSS readers (Feedly, Inoreader, NetNewsWire)
- Standard interchange format for podcast subscription migration across apps (Pocket Casts, Overcast)
- Explicit XML attributes for URLs, feed types, and machine-readable metadata
- Deeply nested parent-child trees supported natively by dedicated outliner software
- Clean, elegant plain text instantly readable without specialized XML viewers
- Universal standard across PKM tools (Obsidian, Logseq, Notion, GitHub, Bear)
- Rich formatting including tables, bold, italics, code blocks, and task checklists (- [x])
- Lightweight, future-proof, and seamlessly version-controlled with Git
OPML remains the undisputed king for migrating RSS feed subscriptions and podcast libraries between aggregators, but its rigid XML syntax makes it awkward for daily reading and note-taking. Converting OPML into clean Markdown with YAML frontmatter turns subscription directories and outlines into beautifully formatted, searchable reference notes in Obsidian or Notion.
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