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GRANT AGREEMENT: 601138 | SCHEME FP7 ICT 2011.4.3 Promoting and Enhancing Reuse of Information throughout the Content Lifecycle taking account of Evolving Semantics [Digital Preservation]
“This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no601138”.
HOW TO MODEL THE USE CASE OF THE NCDD NETWORK OF SHARED FACILITIESDigital Ecosystem Model, EcoBuilder, Modelling strategies Johannes Biermann, Anna Eggers State and University Library Göttingen
▶Digital Ecosystems◦ Types of Change◦ Issues of Digital Ecosystems
▶Digital Ecosystem Model▶Modelling Strategies▶Examples▶EcoBuilder▶Conclusion
Agenda
interwoven evolving networks of ▶digital objects, ▶policies, ▶processes, ▶technical services,▶and user communitieswithin constantly changing and interacting environments influencing digital objects
Digital Ecosystems
Digital Ecosystem Example
UCL Mathematical and Physical Sciences, CC BY 2.0, https://www.flickr.com/photos/uclmaps/8652714974
Institution Data center
UCL Mathematical and Physical Sciences, CC BY 2.0, https://www.flickr.com/photos/uclmaps/8652714974
▶creation, deletion and change of single entities▶change in larger social or cultural contexts
▶merging and growing user communities◦ changing expectations, requirements, and
background knowledge of user communities◦ exchange of digital objects
▶new policies, processes▶technical infrastructure and dependency
changes
Planned and Unplanned Digital Ecosystem change
Complex evolving structures of Digital Ecosystems
Ideal building blocks - neat and tidy
inside a block
?
Because of the complexity of DEs it hard to▶maintain them▶describe them▶introduce changes▶determine impact of change▶identify and resolve problems▶trace provenance
→ use of ontologies
Issues of Digital Ecosystems
• Flexible formal data structure of knowledge• Subject - Predicate - Object structure
• Leaf - is part of - a tree• Reasoning to infer new information• Ensure consistency of the domain representation• graph structure• machine processable• extendable
Ontologies for handling this complexity
To deal with the complexity of Digital Ecosystems it is advisable to follow a defined way of modelling
A Modelling Strategie defines▶The oder in which entities are modelled▶The level of detail of modelling▶The purpose of modelling (scenario)
Modelling Strategies
▶Policy driven modelling (top - down)▶Digital Object based modelling
◦ data flow driven (bottom - up)◦ process driven (top - down)
▶Community interaction driven▶Infrastructure centric
And always purpose driven
Modelling Strategies
▶simulate impact of change▶reveal single point of failures▶use in a sheer curation scenario
◦ extraction of significant environment information
◦ automatic updating of models▶analyse provenance
Resulting Model
describing the Digital EcosystemExample (1)
Institution 1a User Community
Institution 2a User Community
Conversion Servicea Process
Ingesta Process
NCDD compute nodea Technical Service
NCDD guidelinea Policy
Institution 3a User Community
Web Interfacea Service Interface
runs on runs on
executesexecutes
executes
provides access to
is used by
exchange the web interface Example (2)
Institution 1a User Community
Institution 2a User Community
Conversion Servicea Process
Ingesta Process
NCDD compute nodea Technical Service
NCDD guidelinea Policy
Institution 3a User Community
Web Interfacea Service Interface
runs on runs on
executesexecutes
executes
provides access to
is used by
New web Interfacea Service Interface
investigate the impact of a failure of the conversion processThis can be done either
▶in simulations before any failure happens▶or through a static analysis once a failure
occurred
Example (3)
Example (3)
Institution 1a User Community
Institution 2a User Community
Conversion Servicea Process
Ingesta Process
NCDD compute nodea Technical Service
NCDD guidelinea Policy
Institution 3a User Community
Web Interfacea Service Interface
runs on runs on
executesexecutes
executes
provides access to
is used by
Tool for the creation of Digital Ecosystem Models▶GUI
◦ Simplifies the creation of the model◦ Usable by scenario experts without the
necessity to write ontology or Java sources▶Java API
◦ Facilitates integration into workflows ◦ Used by our Mediator Script!
▶Uses Java Jena API - can output OWL/XML or Turtle
EcoBuilder
EcoBuilder
The DEM and the EcoBuilder are available on GitHub. (Apache v. 2 open source license)
https://github.com/pericles-project/DEMhttps://github.com/pericles-project/EcoBuilderhttp://pericles-project.eu/deliverables/75 http://pericles-project.eu/blog/post/EcoBuilder
Any Questions?
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