<note> text of note <\note>
The default heading for the note is "Note". To specify a different heading, use the <head> element.
If you want an icon to appear with the note, define NoteElementDefaultIconFile in an <!entity ...> declaration.
The default note icon named note icon.pm is located in the /usr/dt/dthelp/dthelptag/icons directory.
The <\note> end tag is required.