WINDOW:
Content Model Declaration

Content Rule

(p|heading|listing|itemize|enumerate|tabular|img|video|
 slide-show|sql|flowbox|frame|button|next-button|previous-button|
 back-button|hyperlink|input|scribble|pop-up|browser|
 multiple-browser|radio-button|checkbox|pull-down|vertical-slider|
 horizontal-slider|dialog-window|demo|registration-form|
 question-form|search-form|shopping-bag|shopping-list|
 table-of-contents|open|redraw|suspend|close|next|previous|up|
 down|back|additional|exit|audio|applet|set|empty|non-empty|
 foreach|order|time-line|on-end-of)*