Keepit Course 3: Provenance (and OPM), based on slides by Luc Moreau

Brief Introduction to Provenance "As data becomes plentiful, verifiable truth becomes scarce” http://go-to-hellman.blogspot.com/2010/02/named-graphs-argleton-and- truth-economy.html For JISC KeepItcourse on Digital Preservation Tools for Repository Managers Module 3, Primer on preservation workflow, formats and characterisation Westminster-Kingsway College, London, 2 March 2010

Provenance: example The following excerpt and slides are taken with permission from Moreau, L. The Open Provenance Model:Towards inter-operability of Provenance Systems http://users.ecs.soton.ac.uk/lavm/talks/iam09.pdf Example The provenance of a bottle of wine includes: • Grapes from which it is made • Where those grapes grew • Process in the wine’s preparation • How the wine was stored • Between which parties the wine was transported, e.g. producer to distributer to retailer • Where it was auctioned

Provenance Definition • Oxford English Dictionary: – the fact of coming from some particular source or quarter; origin, derivation – the historyor pedigree of a work of art, manuscript, rare book, etc.; – concretely, a record of the passage of an item through its various owners. • The provenance of a piece of data is the process that led to that piece of data

The Science Lifecycle Virtual Learning Undergraduate Environment Students Next Generation Researchers Digital Libraries scientists Graduate Students Reprints Peer- Reviewed Technical experimentation Journal & Preprints Reports Conference & Papers Metadata Local Data, Metadata, Web Provenance, Scripts, Repositories Certified Workflows, Services, Experimental Results Ontologies, Blogs, ... & Analyses Adapted from David De Roure’s slides

Virtual Learning Undergraduate Environment Students Next Generation Researchers Digital Libraries scientists Graduate Students Reprints Peer- Reviewed Technical experimentation Finding the Provenance Journal & Conference Preprints Reports of research outputs & Papers Metadata across all the systems data transited through Local Data, Metadata, Web Provenance, Scripts, Repositories Certified Workflows, Services, Experimental Results Ontologies, Blogs, ... & Analyses

Open Provenance Model (OPM) • Allows us to express all the causes of an item • Allow for process-oriented and dataflow oriented views • Based on a notion of annotated causality graph Moreau, L., et al. v1.00 (Dec 2007), OPM v1.01 (Jul 2008), OPM v1.1 (Dec 2009)

OPM Requirements • To allow provenance information to be exchanged between systems, by means of a compatibility layer based on a shared provenance model. • To allow developers to build and share tools that operate on such provenance model. • To define the model in a precise, technology- agnostic manner. • To define bindings to XML/RDF separately • To support a digital representation of provenance for any “thing”, whether produced by computer systems or not

OPM Serialisation • OPM is an abstract data model to represent past execution and what causes data and processes to occur • OPM can be serialised in different formats, referred to as “technology bindings” or serializations • OPM XML schema (http://openprovenance.org/model/v1.01.a) • OPM RDF schema • OPM OWL ontology • Effort underway to ensure full equivalence of representations

Nodes • Artifact: Immutable piece of state, which may have a physical embodiment in a A physical object, or a digital representation in a computer system. • Process: Action or series of actions performed on or caused by artifacts, and P resulting in new artifacts. • Agent: Contextual entity acting as a catalyst of a process, enabling, facilitating, controlling, affecting its Ag execution.

Edges A used(R) P wasTriggeredBy P1 P2 wasGeneratedBy(R) P A wasDerivedFrom A1 A2 wasControlledBy(R) Ag P Edge labels are in the past to express that these are used to describe past executions

Illustration • Process “used” artifacts and A1 “generated” artifact A2 • Edge “roles” indicate the function of the artifact with respect to the process (akin used(dividend) used(divisor) to function parameters) • Edges and nodes can be P typed type=division wasGeneratedBy(quotient) wasGeneratedBy(rest) Causation chain: • P was caused by A1 and A2 • A3 and A4 were caused by P A3 • Does it mean that A3 and A4 A4 were caused by A1 and A2?

Time Constraints Ag start: T2 wasControlledBy(R) end: T5 wasGeneratedBy(R) wasGeneratedBy(R) used(R) A used(R) P A T1 T3 T4 T6 T1<T3 (artifact must exist before being used) T2<T3 (process must have started before using artifacts) T3<T5 (process uses artifacts before it ends) T2<T4 (process must have started before generating artifacts) T4<T5 (process generates artifacts before it ends) T4<T6 (artifact must exist before being used) T2<T5 (process must have started before ending) no constraint between t3 and t4

Dublin Core Profile (draft) with Simon Miles and Joe Futrelle • To many people, provenance is primarily about attribution, citation, bibliographic information • DC provides terms to relate resources to such information • DC profile aims to use of Dublin Core terms to OPM concepts and graph patterns

DC to OPM example: dc:publisher state=unpublished A1 publish Ag P wasSameResourceAs wasActionOf person name=Luc wasGeneratedBy A2 state=published

What have we learned about provenance? • Provenance: describes and records the results of processes on objects over time • OPM represents provenance as XML • OPM can be serialised in different formats • RDF, Semantic Web • OPM is a work in progress By working with an open standard model, that can pass information as XML and in standard serialisation formats (e.g. RDF), it should be possible to build provenance services into repository environments

Keepit Course 3: Provenance (and OPM), based on slides by Luc Moreau

by JISC KeepIt project on Mar 08, 2010

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Keepit Course 3: Provenance (and OPM), based on slides by Luc Moreau — Presentation Transcript