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Re: Turtle 2013 grammar improvement suggestion

From: Eric Prud'hommeaux <eric@w3.org>
Date: Mon, 4 Mar 2013 15:16:25 -0500
To: Dave Beckett <dave@dajobe.org>
Cc: public-rdf-comments@w3.org
Message-ID: <20130304201625.GA3609@w3.org>
* Dave Beckett <dave@dajobe.org> [2013-03-04 09:42-0800]
> 
> http://www.w3.org/TR/2013/CR-turtle-20130219/
> 
> In the grammar it is easier to read if quotes inside quotes are
> always written in hex like #xHH
> 
> e.g in rules [24] and [25] about long single and double quotes it
> would be easier to read if it was expressed the way it was written in
> rules [22] and [23] where double quote is written as #x22

Perhaps you only want to change the character ranges, i.e. change:
  [24] STRING_LITERAL_LONG_SINGLE_QUOTE ::= "'''" (("'" | "''")? [^'\]       | ECHAR | UCHAR)* "'''"
  [25] STRING_LITERAL_LONG_QUOTE        ::= '"""' (('"' | '""')? [^"\]       | ECHAR | UCHAR)* '"""'
  [159s] 	ECHAR 	::= 	'\' [tbnrf\"']
to read:
  [24] STRING_LITERAL_LONG_SINGLE_QUOTE ::= "'''" (("'" | "''")? [^#x27\] | ECHAR | UCHAR)* "'''"
  [25] STRING_LITERAL_LONG_QUOTE        ::= '"""' (('"' | '""')? [^#x22\] | ECHAR | UCHAR)* '"""'
  [159s] 	ECHAR 	::= 	'\' [tbnrf\#x22#x27]

Changing all quotes per <http://www.w3.org/TR/xml/#NT-Char> would be rather verbose:
  [22]   STRING_LITERAL_QUOTE             ::= #x22 ([^#x22#x5C#xA#xD] | ECHAR | UCHAR)* #x22
  [23]   STRING_LITERAL_SINGLE_QUOTE      ::= #x27 ([^#x27#x5C#xA#xD] | ECHAR | UCHAR)* #x27
  [24]   STRING_LITERAL_LONG_SINGLE_QUOTE ::= #x27 #x27 #x27 ((#x27  | #x27 #x27 )? [^#x27#x5C] | ECHAR | UCHAR)* #x27 #x27 #x27
  [25]   STRING_LITERAL_LONG_QUOTE        ::= #x22 #x22 #x22 ((#x22  | #x22 #x22 )? [^#x22#x5C] | ECHAR | UCHAR)* #x22 #x22 #x22
  [172s] PN_LOCAL_ESC                     ::= '\' ('_' | '~' | '.' | '-' | '!' | '$' | '&' | #x27 | '(' | ')' | '*' | '+' | ',' | ';' | '=' | '/' | '?' | '#' | '@' | '%')
and maybe change \ to #x5C as well.

Can you reply with a grammar which shows which extreme, or point between the extremes, you feel is most useful to readers?


> Making this consistent would also be better since a couple of times
> I was looking for a " and it was written as a #x22 or vice versa.
> 
> Dave
> 
-- 
-ericP
Received on Monday, 4 March 2013 20:17:26 UTC

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