Merge pull request #77 from ResearchObject/sparql_cq3

Add SPARQL query for CQ3

docs/sparql/cq3.py

@@ -0,0 +1,34 @@
+"""\
+This script contains the SPARQL query for Competency Question 3 "What are the
+configuration files used in a workflow execution step?". The discussion on
+https://github.com/ResearchObject/workflow-run-crate/issues/11 resulted in
+realizing that the use case needed in practice was representing a
+configuration file for the workflow engine, especially from the example given
+by StreamFlow. The configuration file is added to the "object" attribute of
+the "OrganizeAction" corresponding to the workflow execution. Since the other
+objects of the OrganizeAction are of "ControlAction" type, in the query we
+filter them out to get the configuration file.
+"""
+
+import rdflib
+from pathlib import Path
+
+CRATE = Path("crate")
+
+g = rdflib.Graph()
+g.parse(CRATE/"ro-crate-metadata.json")
+
+QUERY = """\
+PREFIX s: <http://schema.org/>
+
+SELECT ?conf
+WHERE {
+?action a s:OrganizeAction .
+?action s:object ?conf .
+FILTER NOT EXISTS { ?conf a s:ControlAction }
+}
+"""
+
+qres = g.query(QUERY)
+for row in qres:
+    print(row.conf)