Common queries

Common queries

These queries can be executed using SPARQL on the returned wfdesc Turtle, and assume these PREFIXes:

PREFIX prov: <http://www.w3.org/ns/prov#> 
PREFIX wfdesc: <http://purl.org/wf4ever/wfdesc#> 
PREFIX wfprov: <http://purl.org/wf4ever/wfprov#> 
PREFIX tavernaprov: <http://ns.taverna.org.uk/2012/tavernaprov/>
PREFIX cnt:  <http://www.w3.org/2011/content#> 
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wf4ever: <http://purl.org/wf4ever/wf4ever#> 
PREFIX comp: <http://purl.org/DP/components#>    

How do I exclude nested workflows from a query?

The wfdesc model does not have a concept of "top-level" workflow, however you can use a SPARQL NOT EXISTS filter to skip any nested workflows:

SELECT ?wf WHERE {
  ?wf a wfdesc:Workflow .

  FILTER NOT EXISTS {
      ?processInParent prov:specializationOf ?wf .
      ?parent wfdesc:hasSubProcess ?processInParent
  } .
}

Thus any workflow ?wf which (specialization) has been used as a sub-process in ?parent are excluded from the result. As SCUFL2 workflows have unique URIs within each workflow bundle, e.g. http://ns.taverna.org.uk/2010/workflowBundle/01348671-5aaa-4cc2-84cc-477329b70b0d/workflow/Hello_Anyone/ - the above would not be excluding a workflow just because its structure has been reused elsewhere.

How do I select processors in the top-level workflows?

A variant of the above is if you are only interested in processors in top-level workflows:

SELECT ?proc WHERE {
  ?wf a wfdesc:Workflow ;
      wfdesc:hasSubProcess ?proc .

  FILTER NOT EXISTS {
      ?processInParent prov:specializationOf ?wf .
      ?parent wfdesc:hasSubProcess ?processInParent
  } .
}