--- a/PPLiteralObjectParser.st	Tue Mar 04 15:32:58 2014 +0100
+++ b/PPLiteralObjectParser.st	Tue Mar 04 15:33:00 2014 +0100
@@ -15,6 +15,10 @@
 	
 	literal asUppercase = literal asLowercase ifTrue: [ ^ self ].
 	^ PPPredicateObjectParser on: [ :value | literal sameAs: value ] message: message
+!
+
+negate
+	^ (PPPredicateObjectParser expect: literal message: message) negate
 ! !
 
 !PPLiteralObjectParser methodsFor:'parsing'!
@@ -28,13 +32,14 @@
 !PPLiteralObjectParser class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/goodies/petitparser/PPLiteralObjectParser.st,v 1.3 2012-05-04 22:00:17 vrany Exp $'
+    ^ '$Header: /cvs/stx/stx/goodies/petitparser/PPLiteralObjectParser.st,v 1.4 2014-03-04 14:33:00 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/goodies/petitparser/PPLiteralObjectParser.st,v 1.3 2012-05-04 22:00:17 vrany Exp $'
+    ^ '$Header: /cvs/stx/stx/goodies/petitparser/PPLiteralObjectParser.st,v 1.4 2014-03-04 14:33:00 cg Exp $'
 !
 
 version_SVN
-    ^ '§Id: PPLiteralObjectParser.st 2 2010-12-17 18:44:23Z vranyj1 §'
+    ^ '$Id: PPLiteralObjectParser.st,v 1.4 2014-03-04 14:33:00 cg Exp $'
 ! !
+