You get the error:
editing mySGML.html
sed: file sedscr_img line 2: Unknown option to `s'
Output written to /tmp/mySGML.html_1402221460
Sed produced an empty file
- check your sedscript.
all done
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When you check the offending line 2 of sedscr_img (remember that sedscr_img is dynamically generated each time you run lyxtox), you see:
s/<img src="\.\/images\/paper-sizes\.png">/<img src=".\/images\/paper-sizes.png" alt="ISO/DIN paper sizes." title="ISO/DIN paper sizes.">/g
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Now it's clear what the error is: the caption to a figure contains a backslash (in "ISO/DIN"), which is used by sed as a regular expression delimiter.
The easiest solution to this seems to be: just avoid using backslash in figure captions! You cannot have everything in this world, it seems...
See Figure 4-2 for the corrected caption of this specific example.
