Extensible%20LD%20Service%20Element%20

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Extensible LD Service ElementHybrid
P2P/ServerRuntime Architecture

• Bill Olivier
• Development Director,Systems and TechnologyJISC

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Extensible Service Proposal

• The problem
• Many new services are becoming available
• How many can we support in LD?
• How should a new service be included in LD?
• Does the LD spec have to be regularly updated?
• Will all runtime environments support all
  services?
• 2 proposals
• An extensible service element for the LD Spec
• A registry for LD Services

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The LD Conference spec

• Essentially maps (open) LD roles to (fixed)
  Conference roles

LD Conference
LD Role 1 Member
LD Role 2 Moderator
LD Role 3 Observer
LD Role 4 Administrator

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The LD Generic spec

• Essentially maps (open) LD roles to (open)
  service roles

LD ltService Typegt
LD Role 1 Service Role 1
LD Role 2 Service Role 2
LD Role 3 Service Role 3
LD Role 4 Service Role 4

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Extensible Service Proposal

• This allows the Service element to be extended
• Service Vocabularies can independent of LD spec
• Need a common registry of Service Definitions
• Type
• Supported roles
• Where service can be obtained
• As Software
• As Online Service/s
• Service interface/s supported (if any)
• Setup
• Runtime

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Hybrid P2P and Server Architecture
Peer 1
Personal LD engine
Multi-player LD Co-ordination
Service (PeerServer)
Peer 2
Personal LD engine
Web Server / LMS 2
Web Server / LMS 1
Session Servlet 2
Session Servlet 1
Session Servlet 4
Session Servlet 3
Personal LD engine
Personal LD engine
Personal LD engine
Personal LD engine
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Learning Design Components

• Search Store Retrieve LD Components Why?
• LD spec defines Metadata for
• LD Units of Learning
• Activities
• Environments
• Resources
• Plays, Acts, Role parts, Activity-Structures?
• This allows them to be indexed and searched for
  and hence reused in higher-level assemblies.
• These can be reused
• Also enable high-level DragnDrop Learningflow
  Editors (as in LAMS authoring)