G. Moerkotte and A. Zachmann. Multiple substitutability without affecting the taxonomy. In Proceedings of the 3rd Int'l Conference on Extending Database Technology, pages 120--135, Vienna, Austria, 1992.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....of abstraction besides roles, namely clusters which can be regarded, at the application level, as contexts through which objects acquire relinquish roles dynamically. Another interesting piece of work, though not as related to the work presented here, is the fashioning mechanism described in [14]. The idea there is to support, through the fashioning mechanism, objects of a certain type class to behave in a way objects of another class would do, where these classes are not necessarily related by the subclass (ISA) relationships. In doing so, it allows a part of an object to be treated as ....

.... This is because a cluster, on one hand, is able to choose some of the objects capabilities in order to gather all the necessary features required by another type (e.g. some cluster s properties may be defined based on the constituents properties, which facilitates taking parts for a whole [14]) roles, on the other hand, allow objects to be treated from some specific angles perspectives (i.e. taking the whole for a part) Also, the types defined by the roles and or clusters can obviously be unrelated to the database classes in the ISA relationships (indeed, that is typically the ....

G. Moerkotte and A. Zachmann. Multiple substitutability without affecting the taxonomy. In Proceedings of the 3rd Int'l Conference on Extending Database Technology, pages 120--135, Vienna, Austria, 1992.

....that entities in the aspect model may have many different unrelated types, and unlike roles they do not simply evolve from one type into another by means of pre specified conditions or inter object relationships. Remote similarity exists with the concept of multiple substitutability as defined in [MoZ92], where the principle of information hiding is used so that an object can either be addressed as any of its constituents or as a whole, depending on the situation. The part of relationship is employed to enforce the different fashion constructs that an object may obtain. This allows an object to ....

Moerkotte G, Zachmann A (1992) Multiple substitutability without affecting taxonomy. In: Pirotte A, Delobel C, Gottlob D (eds) Proc Extending Database Technology Conference 1992, Springer, Berlin, LNCS 580, pp 120-135

....spirit of the architecture proposed by the Ansi X3 Sparc Study Group [oDMS75] We show how the flexibility they provide can be used to cope with various dynamic features of database systems. A number of extensions to the object oriented paradigm have been proposed, e.g. Bor88, RS91, TYH 91, MZ92, Lie86, TYH 91] which try to increase the flexibility of the paradigm and overcome some of its drawbacks. Many proposals have been recently made for the introduction of a view mechanism in object oriented databases [AB91, Ber91, HZ90, RB92, SLT91, SS89, TYI88] An important aspect of ....

Guido Moerkotte and Andreas Zachmann. Multiple Substitutability without Affecting the Taxonomy. In International Conference on Extending Data Base Technology, 1992.

....y On leave from Departamento de Inform atica, Universidade Federal de Pernambuco, Brazil. Partially supported by CNPq grant number 200.803 92.1. Multiple inheritance has been shown to be unsuited to model multiple facets of objects dynamically and in a flexible manner [Bor88, RS91, TYH 91, MZ92] Thus, various extensions to the paradigm have been considered, some of which explore the concept of class virtualization [TYI88, AB91, SLT91] the associated idea of defining multiple interfaces to an object [SS89, TYH 91, RS91] the definition of non strict inheritance mechanisms [Bor88, ....

Guido Moerkotte and Andreas Zachmann. Multiple Substitutability without Affecting the Taxonomy. In International Conference on Extending Data Base Technology, 1992.

....Thus, extending the prototype by an additional adoption mechanism like masking of object would be nice. In [19] we did show how Consistency Control can easily be extended to model versioning of schemas and masking of objects along the version graph by means of the fashion clause (see [18]) Due to space limitations, we skip the detailed description: we solely accompany the development team s effort needed to implement the intended release GOM V1.0. After finishing the design to incorporate versioning and masking, the newly introduced base predicates, rules and constraints have to ....

G. Moerkotte and A. Zachmann. Multiple substitutability without affecting the taxonomy. In Proc. Intl. Conf. on Extending Database Technology (EDBT), pages 120--135, Wien, Mar 1992.

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