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This volume was primarily intended to present selected papers from
the workshop on Theory and Applications of Nested Relations and
Complex Objects, held in Darmstadt, FRG, from April 6-8, 1987.
Other papers were solicited in order to provide a picture of the
field as general as possible. Research on nested relations and
complex objects originates in the late seventies. The motivation
was to obtain data models and systems which would provide support
for so-called complex objects or molecular structures, i.e., for
hierarchically organized data, thereby overcoming severe
shortcomings of the relational model. This theme of research is now
maturing. Systems based on those ideas are beginning to be
available. Languages of various natures (algebras, calculi,
graphical, logic-oriented) have been designed and a theory is
slowly emerging. Finally, new developments in database technology
and research are incorporating features of models involving complex
objects. A variety of approaches is represented in this volume. The
first three papers give overviews of major pioneering
implementation efforts. The fourth paper is devoted to the
important issue of implementation of storage structures. The next
three papers propose excursions in the foundations of nested
relations and complex objects. The following six contributions are
all devoted to modeling of complex objects. The area of database
design is represented by the last four papers.
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