Evolution and Change in Data Management 

About: Evolution and Change in Data Management is an academic conference. The conference publishes majorly in the area(s): Information system & Database schema. Over the lifetime, 30 publications have been published by the conference receiving 731 citations.

Web Application Models Are More Than Conceptual Models

Abstract: In this paper we argue that Web applications are a particular kind of hypermedia application and show how to model their navigational structure. We argue that if we need to design applications combining hypermedia navigation with complex transactional behaviors (as in E-commerce systems), we need a systematic development approach. We present the main ideas underlying the Object-Oriented Hypermedia Design Method (OOHDM) and show that Web applications are built as views of conceptual models. We present the abstraction primitives used to design conceptual and navigational structure of Web applications and describe the view definition language. We introduce navigational contexts as the structuring mechanism for the navigational space. Further work on designing Web applications with OOHDM is also presented.

A Survey of Current Methods for Integrity Constraint Maintenance and View Updating

Abstract: During the process of updating a database, two interrelated problems could arise. On one hand, when an update is applied to the database, integrity constraints could become violated, thus falsifying database consistency. In this case, the integrity constraint maintenance approach tries to obtain additional updates to be applied to re-establish database consistency. On the other hand, when an update request consist on updating some derived predicate, a view updating mechanism must be applied to translate the update request into correct updates on the underlying base facts. In this paper, we propose a general framework to compare and classify current methods in the field of view updating and integrity constraint maintenance. In this sense, we classify them considering how they tackle with both problems and, we also state the main drawbacks these methods have.

Modeling-by-Patterns of Web Applications

Abstract: "A pattern ... describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over" [1]. The possible benefits of using design patterns for Web applications are clear. They help fill the gap between requirements specification and conceptual modeling. They support conceptual modeling-by-reuse, i.e. design by adapting and combining already-proven solutions to new problems. They support conceptual modeling-in-the-very-large, i.e. the specification of the general features of an application, ignoring the detedls. This paper describes relevant issues about design patterns for the Web and illustrates an initiative of ACM SIGWEB (the ACM Special Interest Group on Hypertext, Hypermedia, and the Web). The initiative aims, with the contribution of researchers and professionals of different communities, to build an on-line repository for Web design patterns.

Modeling Cyclic Change

Abstract: Database support of time-varying phenomena typically assumes that entities change in a linear fashion. Many phenomena, however, change cyclically over time. Examples include monsoons, tides, and travel to the workplace. In such cases, entities may appear and disappear on a regular basis or their attributes or location may change with periodic regularity. This paper introduces an approach for modeling cycles based on cyclic intervals. Intervals are an important abstraction of time, and the consideration of cyclic intervals reveals characteristics about these intervals that are unique from the linear case. This work examines binary cyclic relations, distinguishing sixteen cyclic interval relations. We identify their conceptual neighborhood graph, showing which relations are most similar and demonstrating that this set of sixteen relations is complete. The results of this investigation provide the basis for extended data models and query languages that address cyclically varying phenomena.

Metamodeling for Web-Based Teachware Management

Abstract: In this paper we propose a meta-modeling approach to adaptive hypermedia-based electronic teachware that focusses on document structures and navigational services and which is also applicable to knowledge management. An abstract meta-model is presented which is suitable to describe heterogeneous and semi-structured course material from different domains of application on the web. As an instance of this generic framework we derive a sample model for the domain of teaching computer science. Content identification and querying at the meta-level and the use of metadata enhance navigation and facilitate adaptive presentation and navigation as well as reuse and adaption of existing material to new audiences. Each model can serve as a well defined basis for a corresponding XML based learning material markup language (LM2L) representation which can be restructured and rendered by XSL style sheets for different audiences, layouts, or platforms in web based teaching.