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The orlgmal relatIona database model proposed by Codd permltted complex structures to be entrles m a component of a tuple [Cod] However, Codd recommended that only atomic data values be permltted The relatIona model with this restrlctlon to first norms/ /arm (1NF) has gamed wide acceptance One of the earhest suggestlons that 1NF was too restrlctlve came from Makmouchl m 1977 [Mak] Whrle his treatment was fairly Informal, he showed that relaxmg the 1NF restrtctron could more falthfully model some database apphcatlons Slmtlar suggestlons were later made by other researchers [AB, Ban, CT, FA, FVT, Gon, JS, KTT, Kor, KV, Mac, OMO, RKSl, SP, TF, V] Jaeschke and Schek Introduced the NEST and UNNEST operators to restructure relatlons from 1NF to unnormahzed form (JS] Whde they considered nestmg only over smgle attributes, they eatabhshed some important algebraic results

On the expressive power of the extended relational algebra for the unnormalized relational model