[libreoffice-users] odt file contents - naming of files in Pictures/ directory

Hi all; I've just come unstuck near the end of a project.

I'm creating an odt file pretty much from scratch. All works, but I need 
to embed an image within the odt file rather than just linking to an 
external image (the latter works OK).

Unfortunately, images within the Pictures/ directory seem to obey some 
naming convention that's currently outwitting me.

I've tried manually renaming an image inside an existing document and 
editing content.xml to correspond. LO complains the file is broken, 
suggesting the strings cannot be random.

Example names I see in Pictures/ are (the sole 2 pictures from the same 
document):-
10000000000000CE0000008999F5303D619DABFE.png
10000000000000CE000000896E838079907CA15F.png

Changing DABFE to DABFF (and content.xml to match) causes LO to offer to 
repair a broken document -- regenerating the original name.

Can anyone say exactly how those names are generated please? (Or where 
it would be documented. I've seen the odf spec does not define this area.)

Thanks.

--
Mike Scott (unet2 <at> [deletethis] scottsonline.org.uk)
Harlow Essex England
"The only way is Brexit" -- anon.

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