GPL_VERBOSITY_CONCISE,
this method should print a string suitable for parsing by
Parse(string). Return TRUE is the printing succeeded and
FALSE otherwise.
virtual GPL_Boolean Parse(const GPL_String & string) = 0
Parse the contents of string to set the internal state of the
depictable object. By convention, this method should parse any string
produced by a call to Print(string, GPL_VERBOSITY_CONCISE). Return
TRUE if the parsing succeeded and FALSE otherwise.
virtual GPL_String ToString(const Verbosity verbosity) const
Return the string returned by a call to Print(verbosity).