ion, 
   while <kbd>vcenter=true</kbd> centers text in the perpendicular (to reading) direction.
   the 2 attributes may be set both to get full centered text box.<br>
   A <kbd>weight=bold</kbd> attribute may be given for bold text, while a <kbd>slant=italic</kbd> or
   <kbd>slant=oblique</kbd> may specify italic or slanted text.<br>
   A <kbd>hide=true</kbd> will make the specified text invisible unless the <kbd>View-&gt;Show hidden texts</kbd>
   option is enabled.
   If <kbd>hide=instance</kbd> is given