[xml] uri.c vs RFC 3986

[François Delyon <f delyon satimage fr>]

In uri.c,

#define ISA_SUB_DELIM(p)                                                \
      (((*(p) == '!')) || ((*(p) == '$')) || ((*(p) == '&')) ||             \
       ((*(p) == '(')) || ((*(p) == ')')) || ((*(p) == '*')) ||         \
       ((*(p) == '+')) || ((*(p) == ',')) || ((*(p) == ';')) ||         \
       ((*(p) == '=')))

This does not conform to the RFC 3986. The character apos is missing.
RFC -> sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" /  
"," / ";" / "="
Consequently, libxml2 breaks with URI containing unescaped apos  
characters.

Is there a particular motivation to remove the apos character or is  
this a bug?

François.