SCENARIOBASED GENERATION OF DIGITAL LIBRARY SERVICES

1
SCENARIO-BASED GENERATION OF DIGITAL LIBRARY
SERVICES

• Rohit Kelapure, Marcos André Gonçalves, Edward A.
  Fox
• Virginia Tech, Blacksburg, VA, USA

2
Acknowledgements

• NSF Grants
• CITIDEL DUE-0121679
• DL-in-a-box DUE-0136690
• ETANA ITR-0325579
• GetSmart DUE-0121741
• OAD IIS-0086227
• Others
• AOL
• Capes (Brazilian funding agency)
• Mellon AmericanSouth.org

3
Outline

• Problem
• Approach
• 5S, 5SL
• 5SLGen
• Case Studies
• Conclusion and Future Work

4
Problems

• Lack of general models for Digital Libraries
  (DLs)
• Little focus on simplifying the process of
  modeling and building DLs
• Divergent DL architectures
• Monolithic Tightly integrated and generally
  inflexible
• Componentized A network of interoperable
  components aggregated without a design methodology

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Problems (contd.)

• Lack of DL-specific modeling languages, software
  toolkits, prototyping and CASE tools
• Lack of a scenario-based requirements analysis
  and design approach to DLs
• Implication Problems with
• Interoperability
• Customizability

6
Approach

• Based on the formal 5S theory
• Streams, Structures, Spaces, Scenarios and
  Societies
• Use of
• Domain-specific declarative languages (5SL)
• Scenario-based requirements analysis and design
• Componentized architectures
• Automatic transformations/mappings from models to
  code
• Special attention paid to issues of flexibility,
  reusability, and extensibility

7
Approach 5SLGen

• 5SLGen is a new generic digital library
  generator.
• It has been developed, implemented, and deployed
  in several applications.
• 5SLGen yields implementations of digital library
  services from models of DL societies and
  scenarios
• (and from the other Ss).

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5S Model/ 5SL
9
5SLGen Model
10
Overview Architecture for DL Modeling and
Generation
11
5SLGenArchitecture
5SFramework
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Societies-converter Workflow

DL
Designer
Societies
-
converter
Societies
-
converter
Java Represen-tation.
JDOM
JDOM
XMI
XMI
Transform
Transform
Serializer
Serializer
Java
XMIClass
XMIClass
Mapper
Model
Model
Java
Java
Classes
Classes
Xmi2Java
Xmi2Java
Model
Model
5SLGenArchitecture
13
Scenarios-Converter Workflow
State-design pattern
14
Relevance Feedback Search Service UML Sequence
Diagram
Event seq.no. 3
5SLScenarios instance
15
Scenarios-converter Scenario-Synthesis
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Scenarios-converter Scenario-Synthesis (contd.)
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Synthesized-Statechart

• Component statecharts

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Generated DLs

• Union Catalog
• Simple DL with maximum reuse
• 2 components used Search and Browse
• CITIDEL, including VIADUCT
• Aggregates all the 5SLSocieties and 5SLScenarios
  models for its elementary services

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Generated DL Services

• CITIDEL Relevance Feedback Search Service
• Demonstrate extensibility with the ODL Search
  component
• CITIDEL Profile Based Filtering Service
• Demonstrate reusability with the ODL Browse
  component
• CITIDEL Multi-Classification Browsing Service
• Generate complex services without any component
  reuse
• CITIDEL Binding Service
• Complete the set of CITIDEL services

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Profile Based Filtering (PBF) Service 5SFramework
ODL-Browse componenent
Controller
Model
View
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Conclusion

• Introduced a scenario-based approach to the
  generation of componentized DLs
• Applied the 5SFramework for generation of DLs
• Partially validated the theory of 5S
• Demonstrated that complex DLs can be built on the
  basis of a formal theory
• Adherence to open standards (OAI-PMH, ODL, XMI,
  UML) and established design patterns (MVC, GOFs
  State) ensures relevance and extensibility of our
  work.

22
Future Work

• Integration of 5SLGen with 5SGraph
• Improvements to 5SFramework architecture
• Scalability of the generated DLs and DL services
• Automated construction of user-interfaces with
  statecharts
• Support for transaction scoping and error
  handling
• Web services support
• Incorporating the uPortal framework
• Model Validation
• Personalization of the 5S approach using PIPE