Outline Processor Markup Language File
General Information
| Title | OPML File Extension |
| Extension | .opml |
| Full Form | Outline Processor Markup Language File |
| File Type | XML-based Format |
| Developer | UserLand Software |
| MIME Type | text/x-opml |
File Function
| Primary Function | Store outlines |
| Additional Functions | Exchange information |
| Features | Structured, Hierarchical |
File Characteristics
| Quality | Text-based |
| Supports Layers | N/A |
| Supports Transparency | N/A |
| Editable | Yes |
Use Cases
| Data Exchange | RSS feeds, Podcasts |
| Content Structuring | Ideas, Projects |
Security and Practices
| Security Risks | Embedded scripts |
| Best Practices | Validate XML |
Historical/Version Information
| Initial Release | 2000 |
| Latest Revision | OPML 2.0 |
Associated Types
| Similar Extensions | .xml, .rss |
Software Compatibility
| Software | Usage Policy | OS Compatibility |
|---|---|---|
 RSSOwl |
Free | Windows, Mac, Linux |
 Feedly |
Free, Subscription | Web-based |
| OmniOutliner |
Paid | Mac, iOS |