--- trunk/src/mdParser/MDParser.g	2005/12/16 02:57:00	814
+++ trunk/src/mdParser/MDParser.g	2008/07/04 20:54:29	1275
@@ -32,10 +32,12 @@ tokens
   BOND        = "bond";
   BEND        = "bend";
   TORSION     = "torsion";
+  INVERSION   = "inversion";
   RIGIDBODY   = "rigidBody";
   CUTOFFGROUP = "cutoffGroup";
   FRAGMENT    = "fragment";
   MEMBERS     = "members";
+  CENTER      = "center";
   POSITION    = "position";
   ORIENTATION = "orientation";
   ENDBLOCK;
@@ -109,6 +111,13 @@ torsionstatement  : assignment
               | MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
               ;
 
+inversionblock  : INVERSION^ (LBRACKET! intConst! RBRACKET!)?  LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
+          ;
+
+inversionstatement  : assignment
+              | CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
+              ;
+
 rigidbodyblock  : RIGIDBODY^  LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
                 ;
 
@@ -457,7 +466,7 @@ EXPONENT
 // a couple protected methods to assist in matching floating point numbers
 protected
 EXPONENT
-	:	('e'|'E') ('+'|'-')? ('0'..'9')+
+	:	('e'|'E'|'d'|'D') ('+'|'-')? ('0'..'9')+
 	;
 
 protected