JISC IE Metadata Schema Registry Technical Update 23 November 2004

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JISC IEMetadata Schema RegistryTechnical
Update23 November 2004

• Dave Beckett

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Overview

• Server and prototype walkthrough
• MEG client and problems
• Client Changes
• Walkthrough of client
• Technical status

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Dublin Core AP Terminology

• Metadata Vocabularies
• DC ElementsRDF Properties
• DC Encoding SchemesRDF Classes

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LOM AP Terminology

• LOM Data Elements
• Simple
• Root
• LOM Vocabularies
• LOM (in the LOM standard)
• Non-LOM (elsewhere)
• LOM Data Types

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Prototype Server Contents

• IEMSR model for DC and LOM
• LOM IEEE LOM, UK LOM Core AP
• DC 3 DC APs, 7 vocabularies

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MSR Prototype Server

• Demonstration

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Server Prototype Issues

• No authentication
• No protocol updates
• Web interface hard-coded
• No user manipulation of results
• However easy to hack

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Future server work

• Technologies (Java )
• Protocols and standards
• HTTP (1)
• SPARQL for RDF to/from client
• SRW, SRU, OAI, SOAP, ???
• Web site
• Driven from server
• Apache Velocity ???

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MEG client (2002-2003)
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MEG client problems

• Usability
• Unfamiliar model (drag and drop)
• Multiple windows
• Aesthetics
• Ugly
• Technical
• Hard to improve with Java and Swing

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MEG client updates needed

• Better modelling
• After MEG, CORES, evolving best practice
• RDF standardisation
• 2004 RDF specs
• Protocol standardisation
• SOAP, WSDL, OAI, SRW, SRU, SPARQL(sorry for the
  acronym soup)

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Technology changes

• Replace Swing with SWT
• OS native look and feel
• Better looking User Interface
• Application operation changed to better match OS
  norms
• Removed drag and drop
• Single window

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Process changes

• Open Source using SourceForge
• Multiple developers
• Use an experienced desktop application developer
  to refactor the application
• Early work focusing on client

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Important model changes for client

• MEG client DC AP
• IEMSR client DC AP and LOM AP
• Modelling documents
• Authentication
• Moving to standardised service APIs
• JISC IE requirements

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Client Walkthrough

• Screenshots of current code
• Some are mocked up UI

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Client Startup Create Agency
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Loading an existing AP
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Two client modes

• DC AP building a set of property usages
• LOM AP selecting from a tree of data elements

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Create a new AP
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Dublin Core AP in the Client

• Building an AP from emptyOR from an existing AP
• Adding DC elements / Properties
• Making Property Usages

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DC AP Profile properties
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DC AP Search for title
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LOM AP in the Client

• Start from an existing APa sub-tree of the LOM
• Refine / narrow what is allowed
• Add requirementsmandatory, size
• Edit, add vocabularies
• Later Adding extension data elements

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LOM AP search for description
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Current client state

• Interface / model code separated
• Not yet fully re-attached
• Vocabulary updated for IEMSR
• DCAP working soon
• LOMAP model code is new
• LOMAP UI is new
• Running on Windows, OSX, Linux

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Client and Server timelines
Client
Server
MEG server(existing code in Perl)
MEG model
MEG client
MSR model
MSR client
MSR prototype server(MEG server updated)
Nov 2004
MSR server(new code in Java)
MSR model new protocols
Feb 2005
MSR client
Web site
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Client and Server Summary

• Browsing and searching both
• Browsing much better on web
• Editing only in client