Lets start with roundtripping your OPML spec example states.opml. Logseq v0.4.4 import that states.opml into states.opml.md with text contents as below.

title:: states.opml

- United States
	- Far West
		- Alaska
		- California
		- Hawaii
		- Nevada
		- Oregon
		- Washington
	- Great Plains
		- Kansas
		- Nebraska
		- North Dakota
		- Oklahoma
		- South Dakota
	- Mid-Atlantic
		- Delaware
		- Maryland
		- New Jersey
		- New York
		- Pennsylvania
		  id:: 614800f3-e336-45e5-849e-fe64ea361d35
	- Midwest
		- Illinois
		- Indiana
		- Iowa
		- Kentucky
		- Michigan
		- Minnesota
		- Missouri
		- Ohio
		- West Virginia
		- Wisconsin
	- Mountains
		- Colorado
		- Idaho
		- Montana
		- Utah
		- Wyoming
	- New England
		- Connecticut
		- Maine
		- Massachusetts
		- New Hampshire
		- Rhode Island
		- Vermont
	- South
		- Alabama
		- Arkansas
		- Florida
		- Georgia
		- Louisiana
		- Mississippi
		- North Carolina
		- South Carolina
		- Tennessee
		- Virginia
	- Southwest
		- Arizona
		- New Mexico
		- Texas
- United States
	- Far West
		- Alaska
		- California
		- Hawaii
		- Nevada
			- Reno
			- Las Vegas
			- Ely
			- Gerlach
		- Oregon
		- Washington
	- Great Plains
		- Kansas
		- Nebraska
		- North Dakota
		- Oklahoma
		- South Dakota
	- Mid-Atlantic
		- Delaware
		- Maryland
		- New Jersey
		- New York
		- Pennsylvania
	- Midwest
		- Illinois
		- Indiana
		- Iowa
		- Kentucky
		- Michigan
		- Minnesota
		- Missouri
		- Ohio
		- West Virginia
		- Wisconsin
	- Mountains
		- Colorado
		- Idaho
		- Montana
		- Utah
		- Wyoming
	- New England
		- Connecticut
		- Maine
		- Massachusetts
		- New Hampshire
		- Rhode Island
		- Vermont
	- South
		- Alabama
		- Arkansas
		- Florida
		- Georgia
		- Louisiana
		- Mississippi
		- North Carolina
		- South Carolina
		- Tennessee
		- Virginia
	- Southwest
		- Arizona
		- New Mexico
		- Texas
-

That "id:: 614800f3-e336-45e5-849e-fe64ea361d35" is an artifact of my Logseq graph (database) having a block reference to an item called "Pennsylvania". In general you see block level (headlines level) attributes are dropped. And only "title::" page level (head level) attribute was maintained.

Lets now round trip it back into OPML by exporting from states.opml.md page in Logseq v0.4.4 into OPML. The text contents as below:

<?xml version="1.0" encoding="UTF-8"?>
<opml version="2.0">
  <head>
    <title>
      untitled
    </title>
  </head>
  <body>
    <outline text=""/>
    <outline text="United States">
      <outline text="Far West">
        <outline text="Alaska"/>
        <outline text="California"/>
        <outline text="Hawaii"/>
        <outline text="Nevada"/>
        <outline text="Oregon"/>
        <outline text="Washington"/>
      </outline>
      <outline text="Great Plains">
        <outline text="Kansas"/>
        <outline text="Nebraska"/>
        <outline text="North Dakota"/>
        <outline text="Oklahoma"/>
        <outline text="South Dakota"/>
      </outline>
      <outline text="Mid-Atlantic">
        <outline text="Delaware"/>
        <outline text="Maryland"/>
        <outline text="New Jersey"/>
        <outline text="New York"/>
        <outline text="Pennsylvania"/>
      </outline>
      <outline text="Midwest">
        <outline text="Illinois"/>
        <outline text="Indiana"/>
        <outline text="Iowa"/>
        <outline text="Kentucky"/>
        <outline text="Michigan"/>
        <outline text="Minnesota"/>
        <outline text="Missouri"/>
        <outline text="Ohio"/>
        <outline text="West Virginia"/>
        <outline text="Wisconsin"/>
      </outline>
      <outline text="Mountains">
        <outline text="Colorado"/>
        <outline text="Idaho"/>
        <outline text="Montana"/>
        <outline text="Utah"/>
        <outline text="Wyoming"/>
      </outline>
      <outline text="New England">
        <outline text="Connecticut"/>
        <outline text="Maine"/>
        <outline text="Massachusetts"/>
        <outline text="New Hampshire"/>
        <outline text="Rhode Island"/>
        <outline text="Vermont"/>
      </outline>
      <outline text="South">
        <outline text="Alabama"/>
        <outline text="Arkansas"/>
        <outline text="Florida"/>
        <outline text="Georgia"/>
        <outline text="Louisiana"/>
        <outline text="Mississippi"/>
        <outline text="North Carolina"/>
        <outline text="South Carolina"/>
        <outline text="Tennessee"/>
        <outline text="Virginia"/>
      </outline>
      <outline text="Southwest">
        <outline text="Arizona"/>
        <outline text="New Mexico"/>
        <outline text="Texas"/>
      </outline>
    </outline>
    <outline text="United States">
      <outline text="Far West">
        <outline text="Alaska"/>
        <outline text="California"/>
        <outline text="Hawaii"/>
        <outline text="Nevada">
          <outline text="Reno"/>
          <outline text="Las Vegas"/>
          <outline text="Ely"/>
          <outline text="Gerlach"/>
        </outline>
        <outline text="Oregon"/>
        <outline text="Washington"/>
      </outline>
      <outline text="Great Plains">
        <outline text="Kansas"/>
        <outline text="Nebraska"/>
        <outline text="North Dakota"/>
        <outline text="Oklahoma"/>
        <outline text="South Dakota"/>
      </outline>
      <outline text="Mid-Atlantic">
        <outline text="Delaware"/>
        <outline text="Maryland"/>
        <outline text="New Jersey"/>
        <outline text="New York"/>
        <outline text="Pennsylvania"/>
      </outline>
      <outline text="Midwest">
        <outline text="Illinois"/>
        <outline text="Indiana"/>
        <outline text="Iowa"/>
        <outline text="Kentucky"/>
        <outline text="Michigan"/>
        <outline text="Minnesota"/>
        <outline text="Missouri"/>
        <outline text="Ohio"/>
        <outline text="West Virginia"/>
        <outline text="Wisconsin"/>
      </outline>
      <outline text="Mountains">
        <outline text="Colorado"/>
        <outline text="Idaho"/>
        <outline text="Montana"/>
        <outline text="Utah"/>
        <outline text="Wyoming"/>
      </outline>
      <outline text="New England">
        <outline text="Connecticut"/>
        <outline text="Maine"/>
        <outline text="Massachusetts"/>
        <outline text="New Hampshire"/>
        <outline text="Rhode Island"/>
        <outline text="Vermont"/>
      </outline>
      <outline text="South">
        <outline text="Alabama"/>
        <outline text="Arkansas"/>
        <outline text="Florida"/>
        <outline text="Georgia"/>
        <outline text="Louisiana"/>
        <outline text="Mississippi"/>
        <outline text="North Carolina"/>
        <outline text="South Carolina"/>
        <outline text="Tennessee"/>
        <outline text="Virginia"/>
      </outline>
      <outline text="Southwest">
        <outline text="Arizona"/>
        <outline text="New Mexico"/>
        <outline text="Texas"/>
      </outline>
    </outline>
    <outline text=""/>
  </body>
</opml>

Logseq forgets to export the "titlle::" attribute. There's also the erroneous additional blank headlines at the start and end of the outline.

Is that still useful? Is there more complex OPML that you'd like to see being round tripped? Is there a better way to show MD/OPML code blocks in Github comments?

Markdown in Drummer? #4

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