Re: Error S06

While updating the Unicode conformance text, I removed these three errors 
that cannot occur.

Steven

On Wednesday 20 August 2025 15:46:30 (+02:00), Steven Pemberton wrote:

 > 
 > While working on my action to fix error S06, I note that there are a 
couple more that cannot occur as static errors, because the input won't 
make it through the parser. These are the static errors that cannot occur:
 > 
 > 
 > S01
 > It is an error if two rules are not separated by at least one whitespace 
character or comment.
 > 
 > This is already covered by the syntax rule:
 > 
 >     ixml: s, (prolog, RS)?, rule++RS, s.
 > 
 > 
 > S06
 > It is an error if a hex encoding uses any characters not allowed in 
hexadecimal.
 > 
 > This is covered by the syntax rule
 > 
 >     @hex: ["0"-"9"; "a"-"f"; "A"-"F"]+.
 > 
 > 
 > S11
 > It is an error if a string contains a C0 or C1 control character, 
including a line break.
 > 
 > This is covered by the two syntax rules:
 > 
 > 
 >    dchar: ~['"'; Cc];
 >           '"', -'"'. {all characters except controls; quotes must be 
doubled}
 >    schar: ~["'"; Cc];
 >           "'", -"'". {all characters except controls; quotes must be 
doubled}
 > 
 > 
 > On Tuesday 24 June 2025 23:28:32 (+02:00), Steven Pemberton wrote:
 > 
 > > "S06
 > > It is an error if a hex encoding uses any characters not allowed in 
hexadecimal.'
 > > > It's not possible for this error to occur, since it is a syntactic 
error, not a static error.
 > > Steven
 > > >

Received on Tuesday, 3 February 2026 14:34:46 UTC