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Provenance Challenge: A Semantic Web Approach

Provenance Challenge: A Semantic Web Approach. Jennifer Golbeck MINDSWAP University of Maryland, College Park. The Semantic Web. Ontologies are used to create schemas Instances (the data) can be stored anywhere Referenced by its URI

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Provenance Challenge: A Semantic Web Approach

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  1. Provenance Challenge: A Semantic Web Approach Jennifer Golbeck MINDSWAP University of Maryland, College Park

  2. The Semantic Web • Ontologies are used to create schemas • Instances (the data) can be stored anywhere • Referenced by its URI • Semantics of Web Ontology Language (OWL) allow for logical inferences on the data • Much support for aggregation, querying, and browsing

  3. Ontologies for Workflows • Need to represent data about • Execution of workflow • Execution of services • Information about files • Information about dependencies • http://provenance.mindswap.org/provenance.owl

  4. Provenance.owl

  5. Web Services for Process Execution • Web services receive inputs • URIs of input files • The service retrieves the files from the web, perform their action, and output the resulting files to the web (so they have a URI) • Image/Headers/Graphics, etc • Metadata (using the ontology) describing • The provanance of the output files • The service execution

  6. Metadata Aggregation • Central service is pinged or spiders to collect metadata files from service executions • Collection can be queried and browsed • Metadata can be generated anywhere and stored anywhere • http://provenance.mindswap.org

  7. Reasoning over the Data • The big benefit of the Semantic Web • The semantics of properties used (e.g. transitive, symmetric, etc) allow us to trace back through the provenance history easily • Additional rules can be added to further augment existing semantics • E.g. The Service Execution ancestors of a file are all the Service Executions that produced files upon which the file in question is dependent

  8. Querying with SPARQL • SPARQL: SPARQL Protocol and RDF Query Language • Find the outputs of align_warp where the inputs are annotated with center=UChicago. PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX prov: <http://provenance.mindswap.org/provenance.owl#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT DISTINCT ?y WHERE { ?y prov:hasInputFile ?x; prov:serviceUsed prov:align_warp. ?x prov:annotation "center=UChicago". } • Query results are returned as RDF documents

  9. Thanks To • Daniel Krech, creator of Redfoot, the package used on the website, and who helped get all the Semantic Web tool support running • David Wang, who helped with the rules and visualization support

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