Lilypond SVG output in 2.12.1

[Vivian Barty-Taylor]

A while ago, we got a sed script working to fix Lilypond svg output.  
Looking at the SVG output from 2.12.1 on OSX and using InkScape 0.45  
all the grobs are incorrect. I don't have the problems mentioned by  
other users of missing bar lines, so I'll leave this issue.

I investigated the svg file, and found that the unicode values of all  
grobs (a three digit, hexadecimal value) has been offset by 15. Thus  
a quarter-note NoteHead has a unicode value of 136 in Lilypond  
generated SVG, and this needs to be corrected to 127. A G-clef, which  
has a unicode value of 1a7 in Lilypond SVG needs to be corrected to  
197. The previous corrections relating to font-names also need to be  
made - see thread http://lists.gnu.org/archive/html/lilypond-user/ 
2007-09/msg00029.html (Lilypond incorrectly names Century Schoolbook  
and Emmentaler fonts.)

I've had a look at making this correction using a sed script, but  
can't find anything in the documentation relating to the handling of  
hexadecimal numbers. Does anyone have any ideas, before I write a  
script manually correcting each grob? Does anyone know where the SVG  
output is generated and in what language? I might be able to fiddle  
with the source code too, as it seems to be quite a straightforward  
adjustment.

Thanks in advance for any tips.

Cheers,

Vivian.