--- a/DTDs/Project-5.1.dtd	Sat Apr 14 18:48:38 2018 +0200
+++ b/DTDs/Project-5.1.dtd	Sun Apr 15 11:36:43 2018 +0200
@@ -107,7 +107,7 @@
 
 <!ELEMENT   ProjectTypeSpecificData (dict)>
 
-<!ELEMENT   ProjectTypeSpecific (ExtraData?)>
+<!ELEMENT   ProjectTypeSpecific (ProjectTypeSpecific?)>
 
 <!ELEMENT   DocumentationParams (dict)>
 
@@ -161,7 +161,7 @@
                                  Vcs,
                                  FiletypeAssociations,
                                  LexerAssociations?,
-                                 Extra?,
+                                 ProjectTypeSpecific?,
                                  Documentation?,
                                  Packagers?,
                                  Checkers?,