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Hypermedia Research Work

Hypermedia Research Work. Designing Web-based applications with Object Oriented Hypermedia Design Method OOHDM. Scheduling. Introduction OOHDM Methodology Web Design Patterns Web Design Frameworks Conclusions. Introduction. HDM was released in 1993 OOHDM was released in 1995

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Hypermedia Research Work

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  1. Hypermedia Research Work Designing Web-based applications with Object Oriented Hypermedia Design Method OOHDM

  2. Scheduling • Introduction • OOHDM Methodology • Web Design Patterns • Web Design Frameworks • Conclusions

  3. Introduction • HDM was released in 1993 • OOHDM was released in 1995 • Not evidence of success • UML 1.0 appeared in 1997 • OOHDM enriched with new versions and add-ins • New approaches: Design Patterns and Frameworks

  4. OOHDM Methodology • An extension of the Unified Process • Targets: • Systematize the process • Minimize complexity • Increase reusability • Use of design tools • Engineer dream : Automatic implementation

  5. A sample application • A web-based virtual CD store where users can: • Browse CDs by author, subject or relationship • Add CDs to the shopping cart • Order the purchase

  6. Requirements Gathering • Capturing and specifying the functional requirements • Analysis of documents and interviews of users • UML suggest the use of Use Cases Diagram • OOHDM introduces the User Interaction Diagrams (UIDs)

  7. Use Cases Diagram • Specification of the different roles and operations

  8. User Interaction Diagram

  9. Conceptual Design • Underlying structure of the information • Independence of the presentation • UML Class Schema

  10. Navigational Design • Navigational Class Schema

  11. Navigational Design • Navigational Context Schema

  12. Web Design Patterns • Idea from a urban architect: Christopher Alexander • Adapted to Software Engineering in 1998 • Each pattern describes a problem and its solution • The key is reusability

  13. Web Design Patterns • ‘Portal Pattern’ • Problem : Advertise changes and news in a site • Solution : An entry point with arbitrary links

  14. Web Design Patterns • ‘Active Reference Pattern’ • Problem : Users don’t know where they are • Solution : Visual information about the path

  15. Web Design Patterns • ‘Landmark Pattern’ • Problem : Navigational redundancy • Solution : Links to other areas of the application

  16. Web Design Frameworks • Patterns allows the reuse of parts of the architecture • Allow reusing concrete designs in a domain • OOHDM-Frame • Generic Conceptual Model • Generic Navigational Model

  17. Web Design Frameworks • Generic Conceptual Model

  18. REFERÈNCIES  [1] D. Schwabe, F. Garzotto, P. Paolini, "HDM- A Model Based Approach to Hypermedia Application Design", ACM Transaction on Information Systems, Vol. 11, #1, Jan. 1993, pp. 1-26. [2] D. Lange, "An Object-Oriented design method for hypermedia information systems", Proceedings of the 27th. Annual Hawaii International Conference on System Science, January 1994. [3] “Design Patterns, Elements of Reusable Object-Oriented Software” by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (The Gang of Four). [4] D. Schwabe "A Diagrammatic Tool for Representing User Interaction in UML", Lecture Notes in Computer Science, forthcoming, Proc. UML’2000, York, 2000. [5] D. Schwabe "Systematic Hypermedia Application Design with OOHDM", March 1996 [6] D. Schwabe, Gustavo Rossi, Fernando Lyardet "Patterns for Designing Navigable Information Spaces", 1999.

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