By Matthias Jarke (auth.), Matthias Jarke (eds.)
In the early Eighties, a development in the direction of formal undeIStanding and knowledge-based guidance for the improvement and upkeep of database-intensive info platforms grew to become obvious. the crowd of John Mylopoulos on the UniveISity of Toronto and their ecu collaboratoIS moved from semantic versions of data structures layout (Taxis undertaking) in the direction of prior phases of the software program lifecycle. Joachim Schmidt's workforce on the college of Hamburg accomplished their early paintings at the layout and implementation of database programming languages (Pascal/R) and started to contemplate instruments for the advance of enormous database application programs. The Belgian corporation BIM built a quick advertisement Prolog which became out to be precious as an implementation language for item orientated wisdom illustration schemes and as a prototyping device for formal layout versions. Case experiences by means of Vasant Dhar and Matthias Jarke in ny mentioned the necessity for officially representing method wisdom, and a few tasks within the US and Europe started to ponder laptop guidance (CASE) as a workable method of help software program engineering. In 1985, the time seemed ripe for an try at integrating those reviews in a entire CASE framework touching on all stages of a data structures lifecycle. The fee of the eu groups made up our minds in early 1986 to fund this joint attempt through six ecu software program homes and learn associations within the software program know-how part of the ESPRIT I software. The venture used to be given the quantity 892 and the name DAIDA - improvement counsel for clever Database Applications.
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Extra info for Database Application Engineering with DAIDA
To increase the extensibility of the language, we provide a way to talk about assertions. The resulting technique allows meta-level reasoning and is very powerful; we have however exploited this power only in defining attribute metaclasses. We introduce the predicate Holds which is true whenever its argument is an assertion that follows from the KB. Recall that assertions appear in the KB, quoted, as parts of propositions: [Paper, ... , "(Vx/ Paper)(Vy/ Person) ... ", Alltime). In the definition of metaclasses, it is often useful to have constraints and rules which refer to formulas of the assertion language.
J [martian, ... , Wong, T32J Henceforth, every attribute proposition p has a duration component which can be accessed with the expression when (p). , an interval representing the time during which these facts are true in the application domain. History time is useful not only for tokens but also for generic propositions: for example, the definition "personal deduction" in an Income Tax Act, may only apply for this year. A KB records essentially the beliefs of the system, which may be distinct from the actual state of the world at that time.
While Wong was an author for some time before May 1987 (but we do not know the exact time). The corresponding attribute propositions (now 4-tuples) are shown below. [martian, firstAuthor, Stanley, 1986/10 .. *J [martian, ... , LaSalle, 1987/1. *J [martian, ... , Wong, T32J Henceforth, every attribute proposition p has a duration component which can be accessed with the expression when (p). , an interval representing the time during which these facts are true in the application domain. History time is useful not only for tokens but also for generic propositions: for example, the definition "personal deduction" in an Income Tax Act, may only apply for this year.