13) [MANDATORY] A note is a message posted by an authenticated principal. The system must store the following data about them: an instantiation moment, a title (not blank, shorter than 76 characters), an author (not blank, shorter than 76 characters), a message (not blank, shorter than 101 characters), an optional email address, and an optional link. The author must be computed as follows: “〈username〉 - 〈surname, name〉”, where “〈user-name〉” denotes the username of the principal who has posted the note and “〈surname, name〉” denotes his or her full name.
13) [MANDATORY] A note is a message posted by an authenticated principal. The system must store the following data about them: an instantiation moment, a title (not blank, shorter than 76 characters), an author (not blank, shorter than 76 characters), a message (not blank, shorter than 101 characters), an optional email address, and an optional link. The author must be computed as follows: “〈username〉 - 〈surname, name〉”, where “〈user-name〉” denotes the username of the principal who has posted the note and “〈surname, name〉” denotes his or her full name.