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We believe the reason behind this situation is the isolated way in which
update problems have been dealt with in the past and the impossibility of
applying advanced update processing in practical applications (since it is not
provided by major deductive systems).
We want to stress that the difficulties of dealing with intensional infor-
mation are not unique to deductive DBs; they also appear in most kinds of
DBs that provide some mechanism to define this information, like relational,
object-relational, or object-oriented DBs. Hence, those DBs will also need to
deal with some of the problems addressed in this chapter.
The design of deductive DBs to identify derived predicates and
integrity constraints during conceptual modeling was not addressed in this
chapter and is still an open field of research. Some ideas on this topic are pre-
sented in [15, 77].
References
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[3]
Minker, J. (ed.), Foundations of Deductive Databases and Logic Programming, Los
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Das, S. K., Deductive Databases and Logic Programming, Reading, MA: Addison-
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