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diff --git a/helm/DEVEL/pxp/pxp/lexers/pxp_lex_dtd_string.src b/helm/DEVEL/pxp/pxp/lexers/pxp_lex_dtd_string.src
deleted file mode 100644
index 1fb11e652..000000000
--- a/helm/DEVEL/pxp/pxp/lexers/pxp_lex_dtd_string.src
+++ /dev/null
@@ -1,70 +0,0 @@
-(* $Id$
- * ----------------------------------------------------------------------
- *
- *)
-
-
-{
-  open Pxp_types
-  open Pxp_lexer_types
-
-#insert open_pxp_lex_aux_*.src
-#insert pxp_lex_aux.src
-
-}
-
-#insert pxp_lex_defs_*.def
-(* The following scanner is used to determine the replacement text of
- * internal entities:
- *)
-
-rule scan_dtd_string = parse
-    '%' name ';'
-      { let s = Lexing.lexeme lexbuf in
-	PERef (String.sub s 1 (String.length s - 2)) }
-  | '%'
-      { raise(WF_error("The character '%' must be written as '%'")) }
-  | '&' name ';'
-      { let s = Lexing.lexeme lexbuf in
-	ERef (String.sub s 1 (String.length s - 2)) }
-  | "&#" ascii_digit+ ";"
-      { let s = Lexing.lexeme lexbuf in
-	CRef (int_of_string (String.sub s 2 (String.length s - 3))) }
-  | "&#x" ascii_hexdigit+ ";"
-      { let s = Lexing.lexeme lexbuf in
-	CRef (int_of_string ("0x" ^ String.sub s 3 (String.length s - 4))) }
-  | '&'
-      { raise(WF_error("The character '&' must be written as '&'")) }
-  | '\013' '\010'
-      { CRef(-1) }
-  | '\013'
-      { CRef(-2) }
-  | '\010'
-      { CRef(-3) }
-  | '\009'
-      { CharData "\009" }
-  | printable_character_except_amp_percent+
-      { CharData (Lexing.lexeme lexbuf) }
-  | eof
-      { Eof }
-  | _
-      { raise Netconversion.Malformed_code }
-
-(* ======================================================================
- * History:
- * 
- * $Log$
- * Revision 1.1  2000/11/17 09:57:32  lpadovan
- * Initial revision
- *
- * Revision 1.3  2000/08/14 22:18:34  gerd
- * 	Bad_character_stream -> Netconversion.Malformed_code
- *
- * Revision 1.2  2000/05/29 23:53:12  gerd
- * 	Updated because Markup_* modules have been renamed to Pxp_*.
- *
- * Revision 1.1  2000/05/20 20:33:25  gerd
- * 	Initial revision.
- *
- * 
- *)