documented the enums

--Sven

devel-docs/libgimp/tmpl/gimpexport.sgml

@@ -30,22 +30,30 @@ as it will most probably have to open a dialog.
 
 </para>
 
-@CAN_HANDLE_RGB: 
-@CAN_HANDLE_GRAY: 
-@CAN_HANDLE_INDEXED: 
-@CAN_HANDLE_ALPHA: 
-@CAN_HANDLE_LAYERS: 
-@CAN_HANDLE_LAYERS_AS_ANIMATION: 
-@NEEDS_ALPHA: 
+@CAN_HANDLE_RGB: Use if the plug_in can save RGB images.
+@CAN_HANDLE_GRAY: Use if the plug_in can save GRAY images.
+@CAN_HANDLE_INDEXED: Use if the plug_in can save INDEXED images.
+@CAN_HANDLE_ALPHA: Use if the plugin can save an alpha channel with 
+                   all image_types.
+@CAN_HANDLE_LAYERS: Use if the plugin can save multiple layers. 
+@CAN_HANDLE_LAYERS_AS_ANIMATION: Use if the plugin can save multiple layers
+                                 but treats them as frames in an animation.
+@NEEDS_ALPHA: Use if the plugin needs an alpha channels and can't save
+              flat images.
 
 <!-- ##### ENUM GimpExportReturnType ##### -->
 <para>
 
 </para>
 
-@EXPORT_CANCEL: 
-@EXPORT_IGNORE: 
-@EXPORT_EXPORT: 
+@EXPORT_CANCEL: The user chose Cancel in the export dialog. The plugin should
+                terminate itself.
+@EXPORT_IGNORE: The user chose Ignore in the export dialog. No conversion is 
+                performed and the plugin should try to save as usual.
+@EXPORT_EXPORT: The user chose Export in the export dialog. A copy of the 
+                image is created and then converted to fit the needs of the 
+                plugin. The plugin has to take care of deleting the copy when
+		it has finished saving it.
 
 <!-- ##### FUNCTION gimp_export_image ##### -->
 <para>