+-----------------------------------------------------------------------
+
+ <hgroup>
+ [ ... <boolean>s ... ]
+ [ ... <number>s ... ]
+ [ ... <select>s ... ]
+ [ ... <string>s ... ]
+ [ ... <file>s ... ]
+ [ ... <vgroup>s ... ]
+ </hgroup>
+
+ A horizontal group of widgets/groups. No more than 4 widgets
+ or groups should be used in a row.
+
+-----------------------------------------------------------------------
+
+ <vgroup>
+ [ ... <boolean>s ... ]
+ [ ... <number>s ... ]
+ [ ... <select>s ... ]
+ [ ... <string>s ... ]
+ [ ... <file>s ... ]
+ [ ... <hgroup>s ... ]
+ </vgroup>
+
+ A vertical group of widgets/groups. No more than 10 widgets
+ or groups should be used in a column.
+
+ Since the default alignment of widgets is a column, the
+ <vgroup> element is only of use inside an <hgroup> element.
+