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Structured documents (e.g., SGML) can benefit a lot from database support and more specifically from objectoriented database (OODB) management systems. This paper describes anaturai mapping from SGML documents into 00DB's and a formal extension of two 00DB query languages (one SQL-like and the other calculus) in order to deal with SGML document retrieval. Although motivated by structured documents, theextensions of query languages that we present are generai and useful for a variety of otherdoi:10.1145/191839.191901 dblp:conf/sigmod/ChristophidesACS94 fatcat:dtui3repk5f37gmn263qylqy6a