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rdf-pipeline / noflo-rdf-pipeline

Noflo implementation of the RDF Pipeline
Apache License 2.0
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Round tripping: How to handle unbound nested elements in shex? #73

Open dbooth-boston opened 7 years ago

dbooth-boston commented 7 years ago

In FHIR, we want them to not be there. How should shex allow this?

For example, FHIR allows setting of: fhir:Patient.active [ fhir:value "true"^^xsd:boolean ] ; But if no value is bound, then it comes through as: fhir:Patient.active [ fhir:value <undefined> ] ; when we want it to not produce either a fhir:value triple or a fhir:Patient.active triple. Even if we eliminate the immediate triple, we still do not want to emit a triple with an orphan bnode: fhir:Patient.active [ ] ;

How should this be indicated to shex?

dbooth-boston commented 7 years ago

Maybe have a policy:

  1. Eliminate any triple with an undefined S/P/O.
  2. Eliminate any triple with an orphaned implicit bnode. This might require distinguishing between explicit and implicit bnodes.