[Libreoffice] Questions about Easyhack 37007 Add Math symbol "There does not exist"

[Julien Nabet]

Hello,

I'm working on Easyhack 37007. I don't understand how are defined the 
values of RID_XXX starmath/inc/starmath.hrc. First, I thought it was 
Unicode but it's not. Any idea ?
On the same subject, I found in xsltml/xsltml_2.1.2.patch, a reference 
to "not exists" but no reference to "exists", is it a lack or does this 
file reference specific cases ?

Julien.