Description
A backslash in XWiki syntax is currently translated to \$\backslash\$ which makes the XeLaTeX compiler of my MikTex distribution complain:
! Missing $ inserted.
<inserted text> 
                $
I think the $s shouldn't be escaped. So the LaTeX template SpecialSymbolBlock should be changed from
#elseif ($latex.block.getSymbol() == '\')
  \$\backslash\$##
to
#elseif ($latex.block.getSymbol() == '\')
  $\backslash$##
or even better, without entering math mode
#elseif ($latex.block.getSymbol() == '\')
  \textbackslash{}##