M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....conceptual schema is presented in [Ra Rundensteiner, 1995] In the system proposed here, partially derived classes can be defined with non derived elements in the intension as well as in the extension of the class. Other papers on schema evolution [Skarra Zdonik, 1986; Andany et al. 1991; Tresch, 1991; Tresch Scholl, 1992; Monk Sommerville, 1993; Brche et al. 1995; Ferrandina et al. 1995] offer such mechanisms as lazy conversion, or class or schema versioning, with elements common to the derivation relationship; but they do not offer the possibilities that derived and partially derived ....

M. Tresch, "A Framework for Schema Evolution by Meta Object Manipulation," Proc. Int'l Workshop on Foundations of Models and Languages for Data and Objects, pp. 1-13, Aigen, Sep. 1991.

.... samed#meTL # coexistand are accessible d#acce time.Second# instead of converting the existing objects conforming to the current versioned schemaand create new objects und#s the same versioned schema, as it is proposed in ORION [10] Gemstone [11] OTGen [12] O 2 [13] LISPO 2 [14]and COCOON [15], in our mo d#T objects arestored und#e the class version used for their creationand then they aretransformed accord#fo to the class versionused for accessing them. In this way TVOO promotes change transparency in the sense thatd#tTLL55 users are nota#ected by the change. his mechanism can ....

M. Tresch, "A Framework for Schema Evolution by Meta Object Manipulation," Proc. 3rd Int'l Workshop on Fundations of Models and Languages for Data and Objects, Sept. 1991.

....many groups working on various aspects of evolution. 3.1.1 Schema evolution in database systems The literature in this area is quite extensive. Interestingly, most of the work is not very old and has been done primarily in the object oriented database field [SZ86, BKKK87, PS87, AH88, LH90, Tre91, Bar91, Cas91, Zic92, Ber92, SGD93] The related work section in the thesis will benefit a lot from the seminar on Object Oriented Schema Evolution that I took with Prof. Baclawski and Prof. Futrelle and which covered a number of the above papers in depth. To mention here is especially the ....

Markus Tresch. A framework for schema evolution by meta object manipulation. In Proceedings of the 3rd International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

....with a (semi formal) semantics of schema updates restricted to object oriented databases. The ORION system, together with the GemStone ( PS87] BMO 89] and Sherpa ( NR89] systems, are among the first object oriented database systems to support schema type evolution. In the Cocoon project ( Tre91] TS92] an approach to the evolution of schemas in object oriented databases is followed in which schema objects (e.g. object types) are considered to be objects like others (from the application) We will do a similar thing, and consider objects of both levels as objects describing an ....

M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal. 37

....( 4] 30] offers a more detailed taxonomy, together with a (semi formal) semantics of schema updates restricted to object oriented databases. The ORION system, together with the GemStone system ( 38] 7] are among the first object oriented database systems to support schema type evolution. In [52] and [53] an approach to the evolution of schemas in object oriented databases is followed in which schema objects (e.g. object types) are considered to be objects like others (from the application) We will do a similar thing, and consider objects of both levels as objects describing an evolution ....

M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

.... New algorithms have been designed, implemented, and extensively tested and evaluated in comparison with various others [Jia90a, Jia92c] 7 Publications Outside publications: HS91, Jia89, Jia90b, Jia91, Jia92a, Jia92b, LS92b, SLT91, SLT90, SS90a, SS90b, SS91b, SS91a, SST92, SSW91, Sch92a, Sch92b, Tre91, TS92] Internal reports and non refereed publications: DHL 92, Jia90a, LS92c, RRS92, RS92, TRSB92, TS91] Theses: Boo91, Fie91, Fra91, Fri91, Gar91, Ger90, Goh91, Gro91, Jia92c, Kla91, Kla90, Kri90, Lae91, Loe91, Lue92, Mes91, MW89, Ngu91, Rec90, Vet89, Vet90, Wic91, Wil91] ....

M. Tresch. A framework for schema evolution by meta object manipulation. In Proc. 3rd Int'l Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

.... complexity inheritance and encapsulation introduce, class evolution causes a significant impact on the maintenance and testing of an application [10, 20, 54] While evolution has been well researched, the focus has been on maintaining the structural consistency of objects existing in a database [4, 14, 50, 51]. The impact of evolution on existing programs remains to be fully analyzed. Adaptive software [55, 42] refers to a model of object oriented software development in which functional program components are designed to be flexible to changes in the class structure. Behavior is implemented based on a ....

Markus Tresch. A framework for schema evolution by meta object manipulation. In Proceedings of the 3rd International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

....of this set of acceptable logbooks. The logbook is intended as a structuring mechanism for initial specifications in the context of Snapshot Information Systems as well as Temporal Information Systems ( Sno90] Furthermore, it supports the development of Evolving Information Systems (e.g. PW95] [Tre91], NR89] The history of a UoD may also be described by an application model history, such as introduced in [PW95] In this view, the evolution of a UoD is seen as the evolution of its elements. An element evolution describes the state of the element at each point of time. This dual vision on ....

M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

.... (decomposition into primitives) and partly into the fourth (total class hierarchy restructuring through object equivalent transformations, see [Ber91] A class surgery approach has also been undertaken by different other groups, especially in the area of object oriented databases [BKKK87, Tre91, PS87, Zic87] The work around ORION comes closest to ours. Their data model also captures the part of relationship between objects, which seems to be indispensable for this kind of analysis. Since the ORION taxonomy of schema changes is commonly accepted and considered to be complete we give ....

Markus Tresch. A framework for schema evolution by meta object manipulation. Technical report, Department of computer Science, Information Systems -- Databases, ETH Zurich, CH-8092 Zurich, Switzerland, 1991.

....and thus better support change. While the use of object oriented programming languages may help build better structured systems, evolving these systems continues to be a challenge. The effects of schema evolution on existing classes and objects have been well studied and described, 1] 13] [14], 9] while the issues relevant to maintaining object behavior have only begun to be addressed. 5] 2] 6] Utilizing a high level descriptive language to define class structure and behavior enables development of systems which can support evolution, as well as maintain consistency between ....

Markus Tresch. A framework for schema evolution by meta object manipulation. In Proceedings of the 3rd International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

....What they called behavioral abstraction , i.e. deriving a virtual class as the union of all classes whose type contains some given functions, is possible in our approach using queries that mix the meta level and the object level. We allow such queries, however, they have not been discussed here [Tre91] On the other hand, our approach is more general in that it allows all legal queries to serve as view definitions, without introducing any imaginary new objects. This includes joins, for which they have to maintain internal data to make sure that the new view objects get the same ID every time ....

M. Tresch. A framework for schema evolution by meta object manipulation. In Proc. 3rd Int'l Workshop on Foundations of Models and Languages for Data and Objects, Techn. Report, Institut f ur Informatik, TU Clausthal, Aigen, Austria, September 1991.

....errors, function bindings and dependencies between function and query expressions are to be stored. Acknowledgments. The authors are indebted to Hans Jorg Schek, Christian Laasch, and Klaus Ga ner for their helpful discussion on the paper. A preliminary version of the framework was presented in [28]. ....

M. Tresch. A framework for schema evolution by meta object manipulation. In Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

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M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

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M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

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M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

No context found.

M.T. Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3d International Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991. Institut fur Informatik, TU Clausthal.

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Markus Tresch. A Framework for Schema Evolution by Meta Object Manipulation. In Proceedings of the 3rd Int'l Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991, 1991. Also as Technical Report, Institut fur Informatik, TU Clausthal.

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