Confusion with CSS String syntax.

Looking at the current syntax for a CSS String below:
  string 
	{string1}|{string2}

  string1 
	\"([\t !#$%&(-~]|\\{nl}|\’|{nonascii}|{escape})*\"
  string2  
	\’([\t !#$%&(-~]|\\{nl}|\"|{nonascii}|{escape})*\’

A simple string like "hello world" is invalid.  The syntax seems too
restrictive for general strings. Am I misinterpreting something?


Thank you,

Blaine Brodie