CVS difference for ais/ai-00153.txt

--- ais/ai-00153.txt	1999/03/22 23:42:39	1.2
+++ ais/ai-00153.txt	1999/04/01 23:11:02	1.3
@@ -1,64 +1,55 @@
-!standard F.3.1 (04-38)                               99-03-21  AI95-00153/01
+!standard F.3.1 (04-38)                               99-04-01  AI95-00153/01
 !standard F.3.1 (01)
 !standard F.3.1 (43)
 !class binding interpretation 96-09-04
+!status ARG Approved (with changes) 8-0-2  99-03-25
 !status work item 99-03-21
 !status received 96-09-04
 !priority Medium
 !difficulty Medium
 !subject Picture String Grammar or Composition Rules Need Tightening
 
-!summary 99-03-21
+!summary
 
-    Picture strings such as "++++>" are not well formed.
+Picture strings such as "++++>" are not well formed.
 
-!question 99-03-21
+!question
 
 The String "++++>" and like Strings with '>' unmatched by any '<' appear to
-be valid picture strings based on the following
-production sequence:
+be valid picture strings based on the following production sequence:
 
-    picture string ::= ... | non_currency_picture_string
+    picture string   ::= ... | non_currency_picture_string
     non_currency_picture_string ::= all_sign_number | ...
-    all_sign_number             ::= all_sign_fore [...] [>]
-    all_sign_fore               ::= sign_char {...}
-                  sign_char {sign_char | ...}
-    sign_char                   ::= + | - | <
+    all_sign_number  ::= all_sign_fore [...] [>]
+    all_sign_fore    ::= sign_char {...}
+                         sign_char {sign_char | ...}
+    sign_char        ::= + | - | <
 
-    Is the picture string "++++>" well formed? (No.)
+Is the picture string "++++>" well formed? [No.]
 
-!recommendation 99-03-21
+!recommendation
 
- A '>' character can only appear in an all_sign_number if it
-contains '<' characters.
+A '>' character can only appear in an all_sign_number if it contains '<'
+characters.
 
-!wording 99-03-21
+!wording
 
 Extend F.3.1(43) to read:
 
-"If a picture String has '+' or '-' as fixed_LHS_sign, in a
-floating_LHS_sign or in an all_sign_number, then it has no
-RHS_sign {or '>' character}."
+   If a picture String has '+' or '-' as fixed_LHS_sign, in a
+   floating_LHS_sign or in an all_sign_number, then it has no
+   RHS_sign {or '>' character}.
 
-!discussion 99-03-21
+!discussion
 
 The problem is that the production for all_sign_number does not use the
 RHS_sign production, it contains the literal '>'. This is what comes of
 trying to fold the picture string grammar and composition constraints into
-as few words as possible.  Some of the composition constraints are could
+as few words as possible. Some of the composition constraints could
 have been included in a context free grammar but at the expense of making
-it much longer, and more difficult to read.  However, in the case of
-all_sign_number and F.3.1(43) we compressed a little too hard.  If this
-paragraph is written as two rules, it is much easier to read--and is even
-correct:
-
-If a picture String has '+' or '-' as fixed_LHS_sign or in a
-floating_LHS_sign then it has no RHS_sign. If an all_sign_number contains
-'+' or '-' characters then it does not end in a '>' character.
+it much longer, and more difficult to read.
 
-In fact this might be a better way to correct the wording.
-
-!appendix 96-09-04
+!appendix
 
 !section F.3.1(04)
 !subject Picture String Grammar or Composition Rules Need Tightening