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The Digital Assets Repository (DAR) is an eco-system of components developed by
the International School of Information Science (ISIS) at the Bibliotheca
Alexandrina (BA) to create an institutional repository maintaining the Library’s
digital collections. DAR consists of four main modules: DAF (Digital Assets
Factory) a flexible management for the digitization workflow, DAM (Digital
Assets Metadata) a metadata management system based on METS with Fedora
inside supporting synchronization with external sources, a Digital Assets
Publishing layer (DAP) providing a Restful API for building applications on top of
the repository and DAK (Digital Assets Keeper) a storage layer responsible for
caching, versioning and load balancing.
DAR: Institutional Repository Integration in Action
DAF
Derivatives
transformation
Repository Discovery
LayerDerivatives
Core Files Preservation
Quality
Collection / SET
DAM DAK
Storage
Full Text Index
Ingest
Ingestion
Plugins
Application
Synchronization
Publishing Layer (DAP)
· APIs
· Viewers as building
blocks
· Index and Search
· Database
Bibliotheca Alexandrina Website: http://www.bibalex.org/
International School of Information Science: http://www.bibalex.org/isis/
DAF
· Flexible workflow definition, including QA and
redirects
· Different paths for different media types
· Plug-in based; Integrates with other enterprise
tools , ILS and software used for digitization
· Automated and human phases with reporting
· Automated integrity checks at each step of the
workflow
· Automated ingestion into the repository and
archiving
· Available for download at
http://wiki.bibalex.org/DAFWiki
Metadata Management
· The object is described in METS.
· MODS is used for books, 3D objects,
monuments, images …etc.
· Fedora as a metadata registry
· Flexible XML metadata templates and dynamic
forms: Users see human readable field names
with the assistance of authority lists and metadata
is translated into MODs
· Edit/Review workflow
· Synchronization Templates for synchronizing
metadata with backend administration
applications
· Synchronization with ILS (e.g. VTLS), external
DBs or repositories.
Application Integration
· REST based API to allow for automated
application integration
· Applications have access to sets of objects
· Application queries the API for updated items
within its accessible sets of objects
· Updates can be in metadata or content
· The API replies with new or updated objects
within the specified period
· The application loads the updated object
metadata or content
· More advanced features can be built on top of the
API. (e.g. Print on Demand integration)
DAR Books
· Social Features:
§ Rating and comments
§ Create your own bookshelves
§ Embedding and sharing: Facebook, ...etc.
· Annotations
§ Sticky Notes
§ Highlight and underline
§ More to come…
· Morphological full text search (5 languages)
· Search results highlighting
· Embeddable book viewer, can be added to any
webpage.
· Faceted Search
Copyright and Access Module
· Centralized Access Right module
· Takes into consideration the number of copies
allowed for dissemination
· Can define exceptions to override rules (e.g.
prevent a certain object from being displayed)
· Defines rights to certain operations (e.g. view,
print, …etc) based on the application requesting
access
Digital Assets Repository DAR: http://dar.bibalex.org/
Digital Assets Factory DAF: http://wiki.bibalex.org/DAFWiki/
Integrating
applications on top of the Repository
Book viewer with annotations, social
features and faceted search.
Flexible metadata entry templates per
application
DAR Architecture
DAR Detailed Architecture
Metadata Tool (forms)
Born DigitalIngestion plugin
from other sourcesApplication Backend
Discovery layer
View Object
AIP
(A
rch
iva
l In
form
atio
n
Pa
cka
ge
)
Application Logic
Print On Demand (POD)
Book Viewer
Photo Viewer
METS STORE INTERFACE
Adm
in
Too
lA
uthe
ntic
atio
n
SS
O
WorkflowCopyright & Access
Edit
Fedora
(Metadata Registry)Triple Store
Identifiers
UUID
Handle
Search Metadata
+
Full text
Storage Layer
Simple Search Advanced Search
DAF Ingestion Module
Search View
Authority Lookup
Applications
Ing
est R
ep
osito
ry
Syn
ch
ron
iza
tio
n
La
ye
r
Aut
hent
icat
ion
Security
METSfiles
Search IndexMapping
TemplatesTemplateBuilder
Cache Versioning
Load Balancing
Core Files
Derivatives
Streaming
De
riva
tive
s
Online Archive(OnA)
File
Sto
rage
Inde
x
(Sol
r)
REST
RE
ST
REST
RE
ST
General Applications
List of Object Identifiers
Object retrieval
Requests certain objects
Application requests file updates for certain sets
List of Object Identifiers
Metadata retrieval
Get metadata of objects
Application requests the metadata updates for certain sets
Authentication
ILS Synchronization Tool
Archive Collections
e.g. Nasser ...etc.
Flexible control over
digitization workflow
Youssef Mikhail, Noha Adly, Magdy [email protected], [email protected], [email protected]
Bibliotheca Alexandrina , 2011
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