fedora overview

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DelftUniversity ofTechnology

1Overview of Fedora-Commons Repository

Fedora-Commons Repository•A brief overview

Etienne Posthumus, DPO, TU Delft Library

10-04-23




What is it?

Fedora is a general-purpose, open-source digital object repository system.




What is it?


"Flexible Extensible Digital Object Repository Architecture"

NOT the Linux distribution




What is it?


…a persistence and service delivery platform




What is it?


…a persistence and service delivery platform

…implemented as a set of Java services (Tomcat)




What is it?


A well-funded active community with a long history.




Conforms to the OAIS reference model

Open Archival Information System - an ISO model defined by Consultative Committee for Space Data Systems widely adopted in Archives community

Built on sub-systems

Open Source, Open Standards




Persistent digital archive ‘files on disk’ bootstrappeable in the face of disaster XML containers asset management






Persistent digital archive ‘files on disk’ bootstrappeable in the face of disaster XML containers asset managementScaleable triple-store Mulgara






Persistent digital archive ‘files on disk’ bootstrappeable in the face of disaster XML containers asset managementScaleable triple-store Mulgara Service delivery XSLT via Saxon built-in others pluggable






Advantages?

• Scaling• Integrated Asset management• Extensive Versioning• Audit trails• Large(ish) community, esp. mindshare• General ‘fit and polish’

Goal is support for > 10 million objects




Downsides?

• It’s a toolbox not a complete solution (front-end support)• Java code base (for some this is an advantage ;-)• Moving target in terms of innovation (also debatable)• Complexity of some concepts, steep learning curve

A lot of DIY is needed




Digital Object Model

• Compound objects, aggregate items per object





• Compound objects, aggregate items per object• Some ‘reserved’ item IDs





• Compound objects, aggregate items per object• Some ‘reserved’ item IDs• Essentially an XML container




Digital Object Model<foxml:digitalObject PID="demo:31" VERSION="1.1" xmlns:foxml="info:fedora/fedora-system:def/foxml#" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="info:fedora/fedora-system:def/foxml# http://www.fedora.info/definitions/1/0/foxml1-1.xsd"> <foxml:objectProperties> <foxml:property NAME="info:fedora/fedora-system:def/model#state" VALUE="Active"/><foxml:property NAME="info:fedora/fedora-system:def/model#ownerId" VALUE="fedoraAdmin"/> <foxml:property NAME="info:fedora/fedora-system:def/model#createdDate" VALUE="2008-07-02T05:09:42.015Z"/> <foxml:property NAME="info:fedora/fedora-system:def/view#lastModifiedDate" VALUE="2008-07-02T05:09:42.015Z"/> </foxml:objectProperties> <foxml:datastream CONTROL_GROUP="X" ID="DC" STATE="A" VERSIONABLE="true"> <foxml:datastreamVersion CREATED="2008-07-02T05:09:43.328Z" FORMAT_URI="http://www.openarchives.org/OAI/2.0/oai_dc/" ID="DC1.0" LABEL="Dublin Core Record for this object" MIMETYPE="text/xml"> <foxml:xmlContent> <oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"> <dc:title>Apache Batik 1.5 Demo Directory</dc:title> <dc:creator>Chris Wilper</dc:creator> <dc:creator>The Apache Group</dc:creator> <dc:subject>svg</dc:subject><dc:publisher>The Apache Group</dc:publisher> <dc:format>image/svg+xml</dc:format> <dc:identifier>demo:31</dc:identifier> <dc:relation>http://xml.apache.org/batik/</dc:relation> <dc:rights>The Apache License</dc:rights> </oai_dc:dc> </foxml:xmlContent> </foxml:datastreamVersion> </foxml:datastream> <foxml:datastream CONTROL_GROUP="E" ID="DS1" STATE="A" VERSIONABLE="true"> <foxml:datastreamVersion CREATED="2008-07-02T05:09:43.328Z" ID="DS1.0" LABEL="Local copy of batikBatik.svg" MIMETYPE="image/svg+xml"> <foxml:contentLocation REF="http://www.fedora-commons.org/demo/misc/batikBatik.svg" TYPE="URL"/> </foxml:datastreamVersion> </foxml:datastream>

An Example




Content Model Architecture

“an integrated structure for persisting and delivering the essential characteristics of digital objects in Fedora”

Modelling behaviours and structure of objects.

Complicated, fairly new, not widely implemented yet, in flux.

…can also be safely ignored when starting out.(which we did not realise)




Fedora at TU Delft Library

• Used to create a repository Infrastructure




Fedora at TU Delft Library

• Used to create a Repository Infrastructure• Multiple projects:

• Institutional Repository (academic output)• Special Collections (Tresor, bouwkunde dias)• Expert Search (finding People)• 3TU Datacentrum




Implementation

• Front-end is Django application




Implementation

• Front-end is Django application• We use the REST API for communication




Implementation

• Front-end is Django application• We use the REST API for communication• Middleware as Python code providing a web API




Implementation

• Front-end is Django application• We use the REST API for communication• Middleware as Python code providing a web API• MOAI flexible OAI-PMH service




Implementation

• Front-end is Django application• We use the REST API for communication• Middleware as Python code providing a web API• MOAI flexible OAI-PMH service• Indexing via SOLR subsequently linked to DISCOVER




Conversion of existing repository

• Legacy Stellent CMS stored in Oracle• Circa 12000 items• Mostly PDF plus metadata• Conversion scripts in Python• Bulk ingest




Community Participation

• NL Fedora Usergroup• Contact with key Fedora participants at conferences• Presentations and workshop• Developer days planned• Possible collaboration on development• Sponsorship of open-source components




Plans

• Convert existing repository with existing functionality• Incrementally build in new features on ongoing basis• Extend APIs and services• Linked Data repository• More innovative repository applications




Questions?

[email protected]

http://www.fedora-commons.org/

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