Provenance Challenge

Second Provenance Challenge Page

This is the Second Provenance Challenge page for the University of Manchester myGrid team.

Participating Team

• Short team name: myGrid
• Participant names: Qiuwei Yu, Katy Wolstencroft, Khalid Belhajjame, Carole Goble, Robert Steven, Daniele Turi (University of Manchester)
• Project URL: http://www.mygrid.org.uk/
• Reference to first challenge results: myGrid team First Provenance Challenge Results Page

Differences from First Challenge

We implemented some sample Web Services for the processors (such as align_warp, reslice, slice, softmean and convert) rather than using beanshell scripts in the workflow. We also demostrated three different approaches to create the Second Provenance Challenge workflow in Taverna for best practice.

Provenance Data for Workflow Parts

Our metadata and provenance is managed through a NG4J named graph, and we have used TriQL queries to complete the first provenance challenge. In order to meet the requirement of phrase one, our provenance data were collected in the XML notation and are provided as RDF (Resource Description Framework) files. Figure1 graphically presents the schema (also called the data model). This schema also shared under http://www.cs.man.ac.uk/~yuq/SecondChallenge/ProvenanceOntology/.

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  • Figure 1 Provenance ontology abstract view in Protégé

The provenance for the three parts of the primary workflow (which are also recorded with required annotations for query 8 and query 9) are as follows:

• Part 1: SecondChallenge_myGrid_Part1New

• Part 2: SecondChallenge_myGrid_Part2New

• Part 3: SecondChallenge_myGrid_Part3New

In order to produce the complete provenance for part2 and part3, extra constant processors (such as ReslicedImages, ReslicedHeaders, AtlasImage and AtlasHeader) were used to carry the results from one workflow to another. For this reason, each part of the provenance RDF contains:

• Part 1: align_warp and reslice.

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  • Figure 2 - Part 1 of the Primary Workflow

• Part 2: softmean and ReslicedImages and ReslicedHeaders .

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  • Figure 3 - Part 2 of the Primary Workflow

• • reslice (as processors in the part 1) are re-used as data stores to pass values of ReslicedImage and ReslicedHeader into softmean in part 2, reslice can also be viewed as the softmean inputs in part 2.

• Part 3 slicer, convert and AtlasImage and AtlasHeader .

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  • Figure 4 - Part 3 of the Primary Workflow

• • The softmean processor in part 2 exists to carry part of the slicer inputs to part 3. In our original workflow softmean is responsible for holding the values of AtlasImage and AtlasHeader as data stores which need to be passed into slicer in part 3.

The provenance for the three parts of the secondary workflow (which has been modified as per for query 7) are as follows:

• Part 1: SecondChallenge_myGrid_Q7_Part1_New

• Part 2: SecondChallenge_myGrid_Q7_Part2_New

• Part 3: SecondChallenge_myGrid_Q7_Part3_New

Compared with the provenance of the primary workflow runs, these documents contain the same processors except each convert processor has been replaced with two new processors, pgmtoppm and then pnmtojpeg, in order to convert from PGM to JPEG in workflow Part 3. The difference is documented in the adaptation specified by Query 7 and on our first challenge results page which associated with Provenance Query 7.
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