================================================================================
String values
================================================================================

key = multi word non    quoted string
key = hyphenated-value another.value
key = value with trailing spaces      
key = singleword

key = "quoted string"
key = ""

key = 'single quoted string'
key = ''

--------------------------------------------------------------------------------

(document
 (assignment
  (identifier)
  (string
   (string_content)))
 (assignment
  (identifier)
  (string
   (string_content)))
 (assignment
  (identifier)
  (string
   (string_content)))
 (assignment
  (identifier)
  (value))
 (assignment
  (identifier)
  (string
   (string_content)))
 (assignment
  (identifier)
  (string))
 (assignment
  (identifier)
  (string
   (string_content)))
 (assignment
  (identifier)
  (string)))