Advance apology if this has already been considered and discarded as 
impractical, stupid or whatever (since I'm not a programmer)....,but I work 
with raw image files in photography that have 'sidecar' files (XMP) that 
carry the metadata and editing instructions (they're nothing more than 
glorified XML files with a specific purpose). The convention is that the 
file name is the same between the sidecar file and the raw image file. Any 
image editor then knows to read the instructions in the XMP file for 
whatever purpose. The raw image file is never actually touched or written 
to, just the XMP file. Different image editors can ignore any specific XMP 
commands it doesn't understand. It's a widely used convention in that arena 
and well documented.

All of the discussion recently about @shadow files and sharing outlines and 
the structure made me wonder if a similar strategy might work for Leo 
created external files. For example a Leo user opening  SomeFile.py would 
read the outline structure from SomeFile.xmp (or whatever file extension 
makes sense) The non-Leo user opening SomeFile.py would simply see the 
plain .py file with no sentinels. Other Leo users would need both files to 
share the outline structure. Just a thought......

Rob................

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