texvc output format is like that:
+%5 ok, but not html or mathml
c%5%h ok, conservative html, no mathml
m%5%h ok, moderate html, no mathml
l%5%h ok, liberal html, no mathml
C%5%h\0%m ok, conservative html, with mathml
M%5%h\0%m ok, moderate html, with mathml
L%5%h\0%m ok, liberal html, with mathml
X%5%m ok, no html, with mathml
S syntax error
E lexing error
F%s unknown function %s
- other error
\0 - null character
%5 - md5, 32 hex characters
%h - html code, without \0 characters
%m - mathml code, without \0 characters
