pericles process compiler - ‘eye of the storm: preserving digital content in an ever-changing...

GRANT AGREEMENT: 601138 | SCHEME FP7 ICT 2011.4.3Promoting 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”.

PROCESS MODELLING: An Introduction to Aggregated Processes and the PERICLES Process CompilerNoa Campos López, Marcel HellkampGeorg-August-Universität Göttingen, GWDG

Model-driven preservation approachObjectiveEnsure digital content remains accessible, understandable, and reusable in continually evolving environments.

Triplestore

Preservation Processes

Digital Ecosystem

Ecosystem Model

Validation

Model update

Change & modelanalysis

RDF-based descriptions

PERICLES Approach “Preservation by design” with model-driven preservation.

RDF-based “digital ecosystem model” with preservation processes

Model-driven preservation approach

ObservationProcess descriptions are an integrated part of the digital ecosystem model and subject to change.

Triplestore

Digital Ecosystem

Ecosystem Model



Validation

Model update




Triplestore

Workflow Engine



Executable Workflows

Digital Ecosystem

Ecosystem Model

BPMNdescriptions

Process execution

Validation

Model update



ProblemReal-world preservation processes are complex executable workflows. The challenge is to kept them in sync with their model description and react on change.


Triplestore Process Compiler

Workflow Engine

Digital Ecosystem



Executable WorkflowsEcosystem

Model

BPMNdescriptions

Process compilation

Process execution

Validation

Model update



Solution: Process model”Model first” principle. Compile RDF-based process descriptions into executable workflows.


Triplestore Process Compiler

Workflow Engine

Digital Ecosystem



Executable WorkflowsEcosystem

Model

BPMNdescriptions

Process compilation

Process execution

Validation

Model update



Process Compiler: Validates changes before they occur, and updates executable workflows automatically after each change.


Process model: atomic and aggregated processes

Description of an aggregated process

Process flow:- sequential

execution- single

thread

Data flow:- immutable

resources- type-

validated

Exercise I:Design a

preservation action as an aggregated

process

Example: Ingest Digital Artwork

●Policy: ”Digital artwork needs to be analysed and packaged before storing”

● Preservation action: ingest digital artwork1. Check executables for viruses2. Extract metadata (e.g. assets, runtime

dependencies, 32/64 bit, OS)3. Package executable, assets and metadata

in a specific format (e.g. BagIt)

Ingest Digital Artwork as an Aggregated Process

Exercise II:Add new steps to your aggregated

process

Example: Ingest Digital Artwork v2.0● Preservation action: ingest digital artwork1. Check executables for viruses2. Extract assets metadata3. Extract requirements (runtime

dependencies, 32/64 bit, OS)4. Add artist’s personal information to

metadata.5. Package executable, assets and metadata

in a specific format (e.g. bagit)

Any Questions?

Part 2:Process Compiler

Demo

Process Compiler Demo: Last minute update

● In your VM1. Open a Terminal

(Ctrl+Alt+t)2. Run: cd

tools/ProcessCompiler3. Run: git pull4. Run: make5. Klick on ‘runPCDemo.sh`on

your desktop.

Process Compiler Demo

● Alternative:

1. Download or clone https://github.com/pericles- project/ProcessCompiler

2. Run: mvn compile package –DskipTests=true

3.

4.

Run: java–jar target/ModelCompiler-*.jar

Open a Browser at: http://localhost:8080/demo/server

Any Questions?

pericles process compiler - ‘eye of the storm: preserving digital content in an ever-changing...

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