Added comments to NuTemplateElement about actions that are forwarded to template elements by the editor. Removed image file export's support for custom extensions, as it returns an NSImage anyway, and saves its TIFFRepresentation, and another extension would only have caused trouble.

Cocoa/Classes/ResourceDocument.m

@@ -1045,10 +1045,6 @@ static NSString *RKExportItemIdentifier		= @"com.ulikusterer.resknife.toolbar.ex
 		return;
 	
 	theData = [edClass imageForImageFileExport: resource];
-
-	if( [edClass respondsToSelector:@selector(extensionForImageFileExport:)] )
-		extension = [edClass extensionForFileExport];
-	
 	panel = [NSSavePanel savePanel];
 	fName = [[resource name] stringByAppendingFormat: @".%@", extension];
 	

Cocoa/Plug-Ins/ResKnifePluginProtocol.h

@@ -41,11 +41,6 @@ functionality: */
 				image format. This will be a lossy conversion to a TIFF
 				file. */
 +(NSImage*)		imageForImageFileExport: (id <ResKnifeResourceProtocol>)theRes;
-/*! @method		extensionForImageFileExport:
-	@abstract   If you implement imageForImageFileExport, return a string here that
-				provides the proper file extension for your file. By default the
-				host application substitutes "tiff" here. */
-+(NSString*)	extensionForImageFileExport: (id <ResKnifeResourceProtocol>)theRes;
 
 @end
 

NuTemplateEditor/NuTemplateElement.h

@@ -58,5 +58,15 @@
 -(unsigned int)			sizeOnDisk;
 -(void)					writeDataTo: (NuTemplateStream*)stream;
 
+/* Apart from these messages, a NuTemplateElement may also implement the IBActions for
+	the standard edit commands (cut, copy, paste, clear). When an element is selected,
+	the template editor will forward any calls to these items to the element, if it
+	implements them, and it will automatically enable the appropriate menu items. It
+	will also forward validateMenuItem: for the Paste menu item to the element.
+	
+	The showCreateResourceSheet: action will also be forwarded to elements by the
+	template editor. Use this to allow creating new list items or for similar
+	purposes ("Create New Resource..." is renamed to "Create List Entry" while the
+	template editor is key). */
 
 @end