Kbs hyperbook an open hyperbook system for education
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KBS-HYPERBOOK An Open Hyperbook System for Education. Peter Fröhlich, Wolfgang Nejdl, Martin Wolpers University of Hannover. Contents. Motivation: Hyperbooks and Modeling Modeling Framework Meta Model Domain Model Navigational Model Visualization Model Previous Approaches

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Kbs hyperbook an open hyperbook system for education

KBS-HYPERBOOKAn Open Hyperbook System for Education

Peter Fröhlich, Wolfgang Nejdl, Martin Wolpers

University of Hannover


Contents
Contents

  • Motivation: Hyperbooks and Modeling

  • Modeling Framework

    • Meta Model

    • Domain Model

    • Navigational Model

    • Visualization Model

  • Previous Approaches

  • Conclusions and Further Work


Hyperbooks instead of hypertext
Hyperbooks instead of Hypertext

  • Hyperbooks (in contrast to unstructured Hypertext) allow

    • (Multimedia) Knowledge Bases described by an explicit Domain Model

    • Systematic navigation based on book contents

    • Annotation within the hyperbook based on this model

    • Personalization of book content depending on user knowledge and goals


Application of hyperbooks
Application of Hyperbooks

  • Open Hyperbooks (modular course materials by several authors, which include theory and project examples, including student extensions such as tips, comments, seminar work, own project examples, etc.)

  • Specialized training units for workplace education


Semantic models for hyperbooks
Semantic Models for Hyperbooks

  • Hyperbook Modeling extends modeling techniques (semantic data modeling, object oriented software models) by taking hypertext properties (navigation, visualization, etc.) into account


Modeling framework
Modeling Framework

  • Explicit modeling of all hyperbook aspects

    • Domain Model (Objects + Relationships)

    • Navigational Model (Navigation among Topics)

    • Visualization Model (MIME Objects representing topics)

    • User Model (customization of content and structure)



Metamodel
Metamodel

  • Definition of Modeling Language

    • Domain (Classes, Objects, Attributes, Relationships, Objects, Inheritance, Instantiation)

    • Navigation (Hyperlink, Index, Trail)

    • Visualisation (WWW-Page)

    • User (Topic, Dependencies, Knowledge)

    • Metamodel Definition in O-Telos


Domain model
Domain Model

  • Describe domain by a hierarchy of Domain Classes/Objects and their Attributes (including Inheritance and Instantiation)

  • Find Relationships among domain classes (1:1, 1:n, m:n)

  • Book Contents is attached to domain model





Navigational model
Navigational Model

  • Navigational Concepts

    • Links: support 1:1-relationships

    • Index, GuidedTour, IndexGuidedTour: support 1:n-relationships

    • Crossreference-Index supports m:n-relationship

  • Logical Formulas describe how Domain Model Concepts map to Navigational Concepts


Navigation model
Navigation Model

  • Trails

    • Sequence of pages

    • Represent lecture lessons

    • Synchronous slide show with audio annotation

    • Support for printing


Visualization model
Visualization Model

  • Topic is presented by a set of WWW Pages (associated to Domain Units)

  • WWW Page is partitioned into Fragments, which have MIME Types, e.g. text/html

  • Hierarchy of MIME types is part of meta model




Previous approaches 1
Previous Approaches (1)

  • Object-oriented Modeling Techniques

    • Examples

      • Hypertext Design Method (HDM)

      • Relationship Management Methodology (RMM)

      • Object-Oriented Hypermedia Design Model (OOHDM)

    • Suited as database frontends

    • Navigate collections of loosely structured data


Previous approaches 2
Previous Approaches (2)

  • Adaptive Hypertext

    • Examples:

      • Interbook

      • ELM-Art

    • Pages are indexed with high-level concepts from the user model

    • User Model

      • Proposes links among the pages

      • Annotates links


Current hyperbook work
Current Hyperbook Work

  • Further Implementation (extending server prototype, building model-based authoring tool, adaptation of navigational structure)

  • Modeling (Ontologies, Several Domain Models)

  • Development of Hyperbooks (CS I/SW, KI (together with Osnabrück and Hildesheim))

  • User Modelling


Conclusions
Conclusions

  • Definition of a systematic approach to hyperbook design containing

    • Domain Model

    • Navigation Model

    • Visualization Model

    • User Model

  • Based on Declarative Meta Model


Conclusions1
Conclusions

  • Implementation

    • Navigational Structure is generated based on Domain Model and Navigational Rules

    • Generic servlet connected to WWW server evaluates book models (based on meta model) and displays the book using current browsers

    • Modeling Language: O-Telos

    • Meta Database: ConceptBase


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