##Entity groups
##entity groups
##You can define entity groups by defining new entities after the group entity enclosed in curly braces. You can not add more entities later.
hscale=auto;
C: Client;
SI: Server Infrastructure {
    S: Server;
    B: Backend;
};
->C: Hit;
C=>S: Request to Server;
S>>B: Internal Query;
S<<B: Internal Response;
C<=S: Reply from Server;
