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##Box tags
##box series alternative tag page break auto_heading
##Use the 'tag' attribute for boxes to specify a label for the box. This can be used to express alternatives more succintly.
C: Client;
S: Server;
B: Backend;
->C: Hit;
box C==C: Generate\nrequest;
C=>S: Request;
box S--S: Check cache;
box S--B: cache miss
[tag="Alt\#1", color=lgray]
{
S->B: Query;
#break here
newpage [auto_heading=yes];
S<-B: Response;
}
..: cache hit [tag="Alt\#2"]
{
S->S: Read\ncache;
};
C<=S: Reply;
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