# OmniOutliner and OPML

Any OPML outline OmniOutliner exports can be dragged into Marked just like Markdown. Marked converts the outline into readable Markdown headings and nested lists based on OmniOutliner (or generic OPML) structure.

In Marked Settings, Preview pane, separate switches control embedding OPML outlines and OmniOutliner (.ooutline) packages as Mermaid mind maps versus a straight nested Markdown list when you prefer the diagram view.

Separate from OmniOutliner, generic `.opml` files from tools such as Fargo, OutlineEdit, iThoughts (OPML export), or mind-map apps behave the same way.

Related: Embedding Mind Maps and Outlines.

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