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- Feta Architecture
- Ontologist (Chris Wroe) -> Ontology Editor -> DL Reasoner -> Classification (in RDF(S)) -> obtain classification -> Feta, PeDRo
- Store WSDL Descriptions (in special XML schema), then annotate, and give to Feta
- The ontology, classified, and the annotated wsdl are merged into a single graph
- Taverna Workflow Workbench issues "semantic discovery via conceptual descriptions" against feta ... a set of canned queries
- Feta Engine
- Feta Loader uses myGrid service onto and domain onto
- use Jena, e.g., to do RDQL queries, etc.
- Feta Data Model
- Operation (name, description, task -- from a bio service ontology, method -- particular type of algo/codes also from onto but not used much, resource, application, hasInput : Parameter, hasOutput : Parameter)
- Parameter (name, desc, semantic type, format, transport type, collection type, collection format)
- Service (name, description, author, organizations)
- WSDL based operation is a subclass of Operation
- WSDL based Web Service is a subclassof Service (hasOperation : WSDL based operation)
- workflow, bioMoby service, soaplab service, local java code subclasses of Service and Operation
- seqHound service is an operation
- Each parameter can have a semantic type, stating that the parameter is an instance of a class, and the operation can have a "task" which is also a "semantic type" and "method"
- SHIM (need acronym)
- semantically compatible, syntactically incompatible services
- uniprot database (uniprot_record) -> parser and filter shim -> blastp analysis (protein_sequence)
- working definition: a software component who's main purpose is to syntactically match otherwise incompatible resources. it takes some input, performs some task and produces an output. depending on usage, a shim can be semantically neutral ...
- in myGrid, basically doing type manipulations (map between abstract types to concrete types), e.g., embl, genbank, fasta concrete types, dna_sequence is an abstract type
- examples:
- parser / filter
- de-referencer
- syntax translator
- mapper
- iterator
- dereferencer
- service a (genbank id) -> dereferencer -> service b (genbank record)
- retreives information from a URL
- syntax translator
- service a (dna seq; bsml) -> syntax translator -> service b (dna seq; agave)
- mapper
- service a (genbank id) -> mapper -> service b (embl id)
- iterator
- service a (collection of x) -> iterator -> service b (a single x)
- seven steps to shim "nirvana"
- recognize 2 services are not compatible (syntactically, possibly semantically)
- recognize the degree of mismatch
- everything connected to everything
- identify what type of shiim(s) is/are needed
- find or manufacture the shim
- advise user on "semantic safety" of the shim
- not clear what this means ...
- invoke the shim
- record provenance
- my (Shawn's) proposal: a shim is an actor/service whose input semantic type is the same or more general than the output semantic type
- Motivation
- workflows in grid-using communities
- challenges in supporting workflow management
- research on workflow planning at usc/isi
- using ai techniques in Pegasus to generate executable grid workflows
- using metadata descriptions as first step, to get away from the file encodings of VDL and Pegasus
- an operator is specified generally as an (if preconditions then add <stuff>) form, in Lisp/Scheme syntax
- example: user can say: I want the results of a pulsar search at this time and location
- the generation of the operation defs are done by hand ... began looking at how to construct them automatically
- ...
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