OOHDM
Hypermedia Research Work
Designing Web-based applications with Object Oriented Hypermedia
Design Method
OOHDM
OOHDM
Introduction
HDM was released in 1993 OOHDM was released in 1995Not evidence of successUML 1.0 appeared in 1997OOHDM enriched with new versions and add-insNew approaches: Design Patterns and Frameworks
OOHDM
OOHDM Methodology
An extension of the Unified Process Targets:
Systematize the process Minimize complexity Increase reusability Use of design tools Engineer dream : Automatic implementation
OOHDM
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
OOHDM
Requirements Gathering
Capturing and specifying the functional requirements Analysis of documents and interviews of usersUML suggest the use of Use Cases DiagramOOHDM introduces the User Interaction Diagrams
(UIDs)
OOHDM
Conceptual Design
Underlying structure of the information Independence of the presentation UML Class Schema
OOHDM
Web Design Patterns
Idea from a urban architect: Christopher AlexanderAdapted to Software Engineering in 1998 Each pattern describes a problem and its solutionThe key is reusability
OOHDM
Web Design Patterns
‘Portal Pattern’ Problem : Advertise changes and news in a site Solution : An entry point with arbitrary links
OOHDM
Web Design Patterns
‘Active Reference Pattern’ Problem : Users don’t know where they are Solution : Visual information about the path
OOHDM
Web Design Patterns
‘Landmark Pattern’ Problem : Navigational redundancy Solution : Links to other areas of the application
OOHDM
Web Design Frameworks
Patterns allows the reuse of parts of the architectureAllow reusing concrete designs in a domain OOHDM-Frame
Generic Conceptual Model Generic Navigational Model
OOHDM
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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