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OOHDM
Hypermedia Research Work
Designing Web-based applications
with Object Oriented Hypermedia
Design Method
OOHDM
OOHDM
Scheduling
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Introduction
OOHDM Methodology
Web Design Patterns
Web Design Frameworks
Conclusions
OOHDM
Introduction
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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
OOHDM
OOHDM Methodology
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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
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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
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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)
OOHDM
Use Cases Diagram
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Specification of the different roles and operations
OOHDM
User Interaction Diagram
OOHDM
Conceptual Design
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Underlying structure of the information
Independence of the presentation
UML Class Schema
OOHDM
Navigational Design
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Navigational Class Schema
OOHDM
Navigational Design
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Navigational Context Schema
OOHDM
Web Design Patterns
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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
OOHDM
Web Design Patterns
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‘Portal Pattern’
 Problem : Advertise changes and news in a site
 Solution : An entry point with arbitrary links
OOHDM
Web Design Patterns
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‘Active Reference Pattern’
 Problem : Users don’t know where they are
 Solution : Visual information about the path
OOHDM
Web Design Patterns
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‘Landmark Pattern’
 Problem : Navigational redundancy
 Solution : Links to other areas of the application
OOHDM
Web Design Frameworks
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Patterns allows the reuse of parts of the architecture
Allow reusing concrete designs in a domain
OOHDM-Frame
 Generic Conceptual Model
 Generic Navigational Model
OOHDM
Web Design Frameworks
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Generic Conceptual 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]
1996
D. Schwabe "Systematic Hypermedia Application Design with OOHDM", March
[6]
D. Schwabe, Gustavo Rossi, Fernando Lyardet "Patterns for Designing
Navigable Information Spaces", 1999.