1993
DOI: 10.1016/0169-023x(93)90019-l
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Combining active rules and metaclasses for enhanced extensibility in object-oriented systems

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Cited by 24 publications
(6 citation statements)
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“…The work presented in this paper was initiated with a view to providing an effective interface to the extensible OODB ADAM. In ADAM, support for metaclasses as first class objects enabled its core data model to be extended with a range of facilities, including relationship objects [8], active rules [10] and composite objects with versions [22]. Where the data model can be extended with new constructs, it is necessary to be able to extend the interface to the database with visualisations relevant to the extensions, otherwise users are likely to be unaware of the semantics of the objects to which they are exposed [24].…”
Section: Extensible Databases and Their Interfacesmentioning
confidence: 99%
“…The work presented in this paper was initiated with a view to providing an effective interface to the extensible OODB ADAM. In ADAM, support for metaclasses as first class objects enabled its core data model to be extended with a range of facilities, including relationship objects [8], active rules [10] and composite objects with versions [22]. Where the data model can be extended with new constructs, it is necessary to be able to extend the interface to the database with visualisations relevant to the extensions, otherwise users are likely to be unaware of the semantics of the objects to which they are exposed [24].…”
Section: Extensible Databases and Their Interfacesmentioning
confidence: 99%
“…A number of designs and implementations of active databases now exist, and proposals have been made which build upon relational 33,18], extended relational 31], deductive 34,19] and object-oriented 10, 13, 17] data models. Active databases o er a number of advantages over their passive predecessors for a range of di erent categories of application, involving extensions to database systems 5,12,24], data intensive domains 8, 4] and control of external activities 3].…”
Section: Introductionmentioning
confidence: 99%
“…Μια νέα μετα-κλάση δημιουργείται με τον ίδιο τρόπο, αποστέλλοντας δηλαδή το μή νυμα new σε μια άλλη μετα-κλάση. Η δημιουργία νέων μετα-κλάσεων γίνεται για τη μεταβολή της εξ' ορισμού συμπεριφοράς των κλάσεων, για την επέκταση δηλαδή του ίδιου του συστήμα τος (Paton, et al 1993a). Με τη χρήση των μετα-κλάσεων έχουν υλοποιηθεί σχεδόν όλες οι επεκτάσεις του συστήματος ADAM, συμπεριλαμβανομένου και του συστήματος DEVICE που αποτελεί τμήμα της πρωτότυπης συμβολής της παρούσας εργασίας (βλ.…”
Section: αντικειμενοστραφείς βάσεις δεδομένωνunclassified
“…. Επι πλέον, οι μετα-κλάσεις των OODB συστημάτων αποτελούν ένα ευέλικτο εργαλείο με το οποίο μπορεί να υλοποιηθεί η λειτουργικότητα που απαιτείται για τα KBS (Paton, et al 1993a Υπάρχουν δύο μορφές ενεργών κανόνων: οι οδηγούμενοι από δεδομένα κανόνες(ά3ίαdriven rules), και οι οδηγούμενοι από γεγονότα Kavdveç(event-driven rules).…”
Section: εισαγωγήunclassified
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