func (u *ISBN13) UnmarshalText(data []byte) error { // validation is performed later on
	*u = ISBN13(string(data))
	return nil
}
func (u *ISBN13) UnmarshalText(data []byte) error { 
	*u = ISBN13(string(data))
	return nil
}
func ( u * ISBN13 ) UnmarshalText ( data [ ] byte ) error { // validation is performed later on * u = ISBN13 ( string ( data ) ) return nil }
// UnmarshalText hydrates this instance from text
UnmarshalText hydrates this instance from text