Transcript Scenario based generation of digital library services" presentation

SCENARIO-BASED GENERATION OF
DIGITAL LIBRARY SERVICES
Rohit Kelapure, Marcos André Gonçalves,
Edward A. Fox
Virginia Tech, Blacksburg, VA, USA
Acknowledgements
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NSF Grants
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CITIDEL: DUE-0121679
DL-in-a-box: DUE-0136690
ETANA: ITR-0325579
GetSmart: DUE-0121741
OAD: IIS-0086227
Others
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AOL
Capes (Brazilian funding agency)
Mellon: AmericanSouth.org
Outline
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Problem
Approach
5S, 5SL
5SLGen
Case Studies
Conclusion and Future Work
Problems
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Lack of general models for Digital Libraries (DLs)
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Little focus on simplifying the process of modeling and
building DL services
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Divergent DL architectures
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Monolithic: Tightly integrated and generally inflexible
Componentized: A network of interoperable components
aggregated without a design methodology
Problems (contd.)
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Lack of DL-specific modeling languages,
software toolkits, prototyping and CASE tools
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Lack of a scenario-based requirements analysis
and design approach to DLs
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Implication: Problems with
Interoperability
 Customizability
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Approach
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Based on the formal 5S theory
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Streams, Structures, Spaces, Scenarios and Societies
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Use of
 Domain-specific declarative languages (5SL)
 Scenario-based requirements analysis and design
 Componentized architectures
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Automatic transformations/mappings from models to code
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Special attention paid to issues of flexibility, reusability,
and extensibility
Approach: 5SLGen
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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”).
5S Model/ 5SL
Model
Objective
Primitives in 5SL
Streams
Describes properties of the DL
content
text, audio, video, pictures, …
Structures
Specifies organizational aspects of
the DL content
digital object, metadata schema,
collection, classification
schemes, …
Spaces
Defines logical properties and
presentational views of a DL
vector, probabilistic, metric, …
Scenarios
Details the behavior of DL services
service, event, message, action,
sender, receiver, …
Societies
Defines managers, (responsible for
running DL services); actors (those
who use services) and their
relationships
Service Managers, actors (e.g.,
learners, teachers, naïve users)
5SLGen: Model
Spaces
User
Interface
Streams/Structures
displays
participates
communicates
Societies
Manager
Actors
composed of
(component)
Scenarios
binding
composed of
Scenarios
Service
composed of
generates
Elementary
Service
Composite
Service
has
Collecting
Service
Linking
Service
Indexing
Service
Rating
Service
…
Workflow
Societies
5SLSocieties Model
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Service Manager characteristics:
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Name, attributes, operations, type, visibility
Service Manager relationships:
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Associations, generalizations (extends), dependencies
5SLScenarios Model
Overview Architecture for DL Modeling and
Generation
5S
Meta
Model
DL
Expert
5SGraph
DL
Designer
Practitioner
5SL
DL
Models
Teacher
component
pool
ODLSearch,
ODLBrowse,
ODLRate,
ODLReview,
…….
Researcher
5SLGen
Tailored
DL
Services
DL
Designer
5SLGen:Architecture
5SLSocieties
Model
XMI
Serialized
5SLSocieties
model
5SLScenarios
Model
Scenarios
converter
Societies
converter
Synthesized
Statechart
5SLGen
Component
Pool
Java
import
ODL
Search
Wrapping
ODL
Browse
Wrapping
Java
Controller
Class
5SFramework
import
Java
Java
Classes
Model
JSP
User
Interface
View
DLServices Implementation
Web
Designer
Societies-converter: Workflow
DL
Designer
5SLSocieties
Model
Societies -converter
Java
Representation.
JDOM
Transform
Java
Mapper
Java
Classes
Model
XMI
Serializer
XMI:Class
Model
Xmi2Java
5SLGen:Architecture
Scenarios-Converter: Workflow
5SLScenarios
Model
DL
Designer
JDOM
Transform
Scenario
Synthesizer
Scenarios-converter
Java
Controller
Class
State Machine
Compiler
Statedesign
pattern
Synthesized
Statechart
Relevance Feedback Search Service
UML Sequence Diagram
Event
seq.no. =
3
5SLScenarios
instance
Scenarios-converter: Scenario-Synthesis
Scenarios-converter: Scenario-Synthesis (contd.)
Synthesized-Statechart
Component statecharts
Generated DLs
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Union Catalog
Simple DL with maximum reuse
 2 components used: Search and Browse
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CITIDEL, including VIADUCT
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Aggregates all the 5SLSocieties and
5SLScenarios models for its elementary services
Generated DL Services
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CITIDEL: Relevance Feedback Search Service
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CITIDEL: Profile Based Filtering Service
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Demonstrate reusability with the ODL Browse component
CITIDEL: Multi-Classification Browsing Service
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Demonstrate extensibility with the ODL Search component
Generate complex services without any component reuse
CITIDEL: Binding Service
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Complete the set of CITIDEL services
Profile Based Filtering (PBF) Service
5SFramework
ODL-Browse
Controlle
r
componenent
Model
View
Conclusion
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Introduced a scenario-based approach to the generation of
componentized DLs
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Applied the 5SFramework for generation of DLs
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Partially validated the theory of 5S
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Demonstrated that complex DLs can be built on the basis
of a formal theory
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Adherence to open standards (OAI-PMH, ODL, XMI,
UML) and established design patterns (MVC, GOF’s
State) ensures relevance and extensibility of our work.
Future Work
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Integration of 5SLGen with 5SGraph
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Improvements to 5SFramework architecture
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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
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Model Validation
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Personalization of the 5S approach using PIPE