Object identity

Khoshafian, Setrag; Copeland, George P.

doi:10.1145/960112.28739

Cited by 192 publications

(23 citation statements)

References 26 publications

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“…Thus, especially in these domains, most constraint handling could be avoided if we have another way to say that all variables and constants mentioned in a description are distinct. One way of doing this is employing the object identity (OI) assumption (Khoshafian and Copeland, 1986). OI provides a different semantics to formulas that enforces that all different variables will be bound by different domain objects.…”

Section: Other Extensions and Domain Theoriesmentioning

confidence: 99%

Logic of Adaptive Behavior

Otterlo¹

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PrefaceOne the central themes of this book is the interplay between representation and behavior. Representation is about the way we look at our world, about how we see the things around us, and about how we think about and evaluate the concepts and knowledge that shape our surroundings.Behavior is about what we do, about our actions in the world or the mental actions in our head, and about the consequences of a wide variety of activities we engage in every day. Our representation of the world determines our behavior, but at the same time, our behavior influences what we see, and with that, it changes our representation of the world. This strange, mutually modifying loop is a fascinating phenomenon and it is the core object of study in both psychology and artificial intelligence. Indeed, much of the material in this book is about formal models and algorithms that characterize how computer-based, intelligent systems can represent their mathematical worlds and how they can behave rationally in such worlds. However, the pattern of this loop is much more general, and can be observed almost anywhere. For example, every paper I read changes my representation of my own scientific world, but at the same time, my research activities determine my choices for further study.Out of the many possible things that may be present in your representation of your world, and that may be part of your behavioral pattern, are people. Most of our representations of our world, our thinking, our talking, and our behavioral patterns, involve people. Especially in the path leading to this book, my representation of the world, and my course of action, have been influenced by so many people. For starters, in the writing of this book I have been influenced by many great scientists. There are many of them who I know personally and with whom I had the privilege to engage in interesting interactions, but there are many others that have influenced me without them knowing, for example when I attended their talks or read their books and papers. At this place, I want to express my gratitude to a number of specific people that have influenced me, helped me, supported me and made my life so much more interesting and enjoyable.First of all, I would like to thank my promotor Anton Nijholt for giving me the opportunity to do a PhD in his research group, and for the complete freedom and support he has given me to pursue my own interests, even when my path led me to new topics, to Utrecht and even to Freiburg. I thank Mannes Poel for all his support, his open-door policy that made it possible to just drop by with a coffee and start a discussion on any topic that was on my mind at those specific moments, for all the fun lunch walks, the stimulating educational activities we did together and all the other things that made our interactions fun and interesting.Many thanks go to my promotor John-Jules Meyer. His endless kindness, support and expertise have had great influence on my journey through my PhD period. I vividly remember our productive discussions, alwa...

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Section: Other Extensions and Domain Theoriesmentioning

confidence: 99%

Logic of Adaptive Behavior

Otterlo¹

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“…In that paper we have also shown that a dissection of the concept of object identity and a strict separation of the included notions of reference and comparison is needed in order to introduce means for dynamic object replacement. This can be illustrated with an implementation technique called "Identity Through Indirection" in [11]. Here, a reference to an object is realised as an object-oriented pointer (OOP).…”

Section: Dynamic Object Replacementmentioning

confidence: 99%

“…To be able to compare objects we combine "Identity Through Indirection" with "Identity Through Surrogates" [11]. Each object is supplemented with an attribute that stores a comparand.…”

Section: Dynamic Object Replacementmentioning

confidence: 99%

Dynamic Replacement of Active Objects in the Gilgul Programming Language

Costanza

2002

Lecture Notes in Computer Science

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Abstract.Gilgul is an extension of the Java programming language that allows for dynamic object replacement without consistency problems. This is possible in a semantically clean way because its model strictly separates the notions of reference and comparison that are usually subsumed in the concept of object identity. This paper sketches problems that occur in attempts at replacements of active objects and presents some solutions, including both variants that preserve consistency and those that trade consistency for timeliness. The latter are enabled by means of the new recall construct that even allows for the replacement of objects with non-terminating loops.

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“…Although problematical in the relational model, it is possible that approaches to nulls based on the criterion of identity ( eg, that of Larner Lar91]) may b e w ell suited to an object oriented model where identity i s a central concept ( KC86]). This is a topic for further research.…”

Section: Treatment O F Null Valuesmentioning

confidence: 99%

A conceptual language for querying object oriented data

Barclay

Kennedy

1994

Directions in Databases

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Abstract. A v ariety of languages have been proposed for object oriented database systems in order to provide facilities for ad hoc querying. However, in order to model at the conceptual level, an object oriented schema de nition language must itself provide facilities for describing the behaviour of data. This paper demonstrates that with only modest extensions, such a schema de nition language may s e r v e as a query notation. These extensions are concerned solely with supporting the interactive nature of ad hoc querying, providing facilities for naming and displaying query operations and their results. OverviewSection 2 reviews the background to this work its objectives are outlined in section 3. Section 4 describes NOODL constructs which are used to de ne behaviour within schemata, and section 5 examines how these may be extended for interactive use. The resulting query notation is evaluated in section 6. Section 7 outlines some further work and section 8 concludes.2 Background NOM (the Napier Object Model) is a simple data model intended to allow object oriented modelling of data at a conceptual level it was rst presented in BK91] and is described fully in Bar93]. NOM has been used to model BK92a] and to support the implementation BFK92] of novel database applications, and also for the investigation of speci c modelling issues such as declarative i n tegrity constraints and activeness BK92b] and the incorporation of views BK93] in object oriented data models.The data de nition and manipulation language NOODL (Napier Object Oriented Data Language) may be used to specify enterprises modelled using NOM. A NOODL schema contains a list of class de nitions, which s h o w the name and ancestors of each class.A class de nition also includes the names, sorts, and de nitions of the properties of each class. Property de nitions may c o n tain simple expressions showing how t h e value of the property is derived from those of other properties. The ability to specify such derived properties allows the capture of data's behaviour within the enterprise schema. A class de nition may also contain operations, constraints, and triggers, which are not discussed in detail here (see BK91] or Bar93] for more details).

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Object identity

Cited by 192 publications

References 26 publications

Logic of Adaptive Behavior

Logic of Adaptive Behavior

Dynamic Replacement of Active Objects in the Gilgul Programming Language

A conceptual language for querying object oriented data

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