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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 Elements

[RDF Properties]

• DC Encoding Schemes[RDF 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 AP:a sub-tree of the LOM

• Refine / narrow what is allowed• Add requirements:

mandatory, 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 timelinesClient Server

MSR client

MSR server(new code in Java)

MEG client

MSR prototype server(MEG server updated)

MEG server(existing code in Perl)

MSR client

MEG model

MSR model

MSR model + new protocols Feb 2005

Nov 2004

Web site

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Client and Server Summary

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