▁the ▁two . ▁ ▁Pres entation ▁B log ▁entries ▁are ▁usually ▁laid ▁out ▁as ▁follows : ▁Title ▁Date ▁Body ▁Comment s , ▁perm al ink , ▁and ▁what ▁category ▁the ▁entry ▁was ▁posted ▁to ▁( known ▁as ▁metadata ) ▁ ▁Perm al inks ▁are ▁usually ▁denoted ▁by ▁text ▁link ▁( i . e . ▁" Perm al ink " ▁or ▁" Link ▁to ▁this ▁Entry "), ▁but ▁sometimes ▁a ▁symbol ▁may ▁be ▁used . ▁The ▁most ▁common ▁symbol ▁used ▁is ▁the ▁hash ▁sign , ▁or ▁# . ▁However , ▁certain ▁websites ▁employ ▁their ▁own ▁symbol ▁to ▁represent ▁a ▁perm al ink ▁such ▁as ▁an ▁a ster isk , ▁a ▁dash , ▁a ▁pil c row ▁( ¶ ), ▁a ▁section ▁sign ▁( § ), ▁or ▁a ▁unique ▁icon . ▁ ▁Perm al ink ▁detection ▁Perm al inks ▁can ▁be ▁indicated ▁within ▁the ▁HTML ▁of ▁a ▁page ▁so ▁as ▁to ▁allow ▁autom ated ▁brow sing ▁tools ▁to ▁detect ▁the ▁perm al ink ▁and ▁use ▁it ▁for ▁linking ▁instead ▁of ▁the ▁stated ▁URL . ▁The ▁link ▁element ▁should ▁include ▁the ▁following ▁attributes : ▁< link ▁rel =" book mark " ▁href =" http :// example . com / book mark / 1 2 3 /" ▁/> ▁ ▁See ▁also ▁Pers istent ▁identifier ▁Deep ▁linking ▁Digital ▁object ▁identifier ▁( DO I ) ▁Pers istent ▁uniform ▁resource ▁loc ator ▁( P URL ) ▁Pur ple ▁Num bers ▁( paragraph - level ▁ident ifiers ) ▁Un iform ▁Resource ▁Identifier ▁( URI ) ▁URL ▁mapping ▁Per ma . cc