Design of data-intensive Web-based information services

Abstract

One common usage of the WWW is t o provide informa-tion services, e.g. for regional event calenders, university lecture management, travel information, etc. Their design requires a clear picture of the system's usage and the supported technical environment. The core of the problem is to provide flexible access units based on extended views o n some underlying database. The extension consists in escort information, links, operational facilities and means for the generation of diflerent presentations. W e shall call such units media objects. In order t o allow also a flexible presentation for them, we adapt the metaphor of a container. I n this way it is possible t o present the same information in various ways depending on the user' profile and the possible technical restrictions of the display device.

Knowledge mining for supporting learning processes

“…However, the limitation to WIS and e-Learning is also revealed by the necessity to formally distinguish media types [7] and to integrate context [12]. A first approach in distinguishing various abstraction layers in storyboards was introduced in [11].…”

A Framework for the Management of Context Data in Adaptive Web Information Systems

“…Contexts are a special kind of objects that represent real world divisions or environments. In [8] the authors consider a context as a set of user profiles, and organize them using a concept of dimension (similar as in our approach). The dimension is used to organize the data of a profile in totally ordered sets.…”

A Three-Level Architecture for Distributed Web Information Systems

“…This means to transform a set {v 1 A raw media type has a name M and consists of a content data type cont(M ) with the extension that the place of a base type may be occupied by a pair : M with a label and the name M of a raw media type, and a defining query q M with create-facility such that ({t M }, q M ) defines a view. Here t M is the type arising from cont(M ) by substitution of URL for all pairs : M .…”

“…Formally, we define a partial order ≤ on content data types, which extends subtyping [1]. If cont(M ) is the content data type of a raw media type M and sup(cont(M )) is the set of all content expressions exp with cont(M ) ≤ exp, then a partial order M on sup(cont(M )) extending the order ≤ on content expressions is called an cohesion order .…”

“…Media objects [1] support tight integration between a global data and operations level and a local interface and dialogue level in WISs. Roughly speaking a media object abstracts from the content and functionality of a web-page in a WIS including the navigation links.…”