3 ** Unify entity display specifications to 'mime-preview-condition
5 ** Mother entity should modify preview-situation of children
7 ** Better implementation for multipart/alternative
9 ** Change 'mime-acting-condition to condition-tree format
11 ** dynamic configuration for 'mime-preview-condition
15 ** dynamic configuration for 'mime-acting-condition
20 ** WYSIWYG editing support
22 ** Use MIME-Preview like tag and display