@techreport{R-85-06, TITLE = {Relational Algebra in I.M.S. Theory}, AUTHOR = {Ralph R{\"o}nnquist}, YEAR = {1985}, NUMBER = {R-85-06}, INSTITUTION = ida, ADDRESS = idaaddr, ABSTRACTURL = {/publications/cgi-bin/tr-fetch.pl?r-85-06+abstr}, ABSTRACT = {On basis of the notion of a semantic database, and by utilizing the theory of Information Management Systems, we study the schema concept in a relational database and give a formal description of the schema handling implied by operations of relational algebra. Our frame-work presents a natural conceptualization of database schemes, independent of the actual design model, and enables further investigations to be made on a formal ground.}, IDANR = {LiTH-IDA-R-85-06}