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15:06:05 <dbooth> Topic: R4 issues and plans for R5
15:06:28 <dbooth> harold: One goal is round-trippability of FHIR JSON <--> FHIR RDF, without losing or gaining information.
15:07:25 <dbooth> ... Design decisions in FHIR RDF R4 made sure that we could round-trip, but it added complexity, such as an extra blank node to allow extensions on a boolean.
15:07:45 <dbooth> ... We should revisit some of these decision, to make FHIR RDF easier to use.
15:08:35 <dbooth> ... But we don't want to make unneeded.
15:09:02 <dbooth> Topic: Issue 77: Blank nodes to support FHIR extensions
15:39:12 <dbooth> jim: Option 1 Will make OWL unhappy, because the same property would be both datatype and object type property.
15:40:00 <dbooth> harold: could add .extension to the property, like syntactic convention of underscore in front of the property name.
15:53:15 <dbooth> siviram: Nice to have the consistency of everything using the fhir:value everywhere.
15:53:53 <dbooth> emily: over-engineering may not be worth changing this.
15:54:30 <dbooth> harold: We thought we had over-engineered it when we came up with this.
15:56:01 <dbooth> gopi: would like to known where those blank nodes are.  Might be easier to explain to non-RDF people without the blank nodes.  But if it's a set pattern you can get used to it.
15:57:53 <dbooth> harold: While FHIR allows datatype extensions, and shows how it might be done, but how many profiles actually do this?  Anybody?
15:58:28 <dbooth> ... We could just say that we don't support primitive extensions in RDF, or we support them the way JSON does, with an underscore in front of the name.
15:59:25 <dbooth> sivaram: OWL distinguishes datatype properties from object properties, but most languages don't make that distinction.
16:00:07 <dbooth> harold: FHIR makes an internal distinction between datatypes (as we know them; value is its identity) and compound datatypes (that still lack identity).
16:02:45 <dbooth> sivaram: There's the basic data, and then inferred data.  Maybe treat the extensions as a similar enrichment, so a short-cut way to the value -- a shadow property that mirrors the object property.
16:19:37 <dbooth> Captured in issue 77: https://github.com/w3c/hcls-fhir-rdf/issues/77
16:22:33 <dbooth> Present: David Booth, Harold Solbrig, Emily Pfaff, Gopikrishnan Chandrasekharan (Gopi), Gaurav Vaidya, Jim Balhoff, Sivaram Arabandi
16:22:41 <dbooth> Meeting: FHIR RDF
16:22:45 <dbooth> Chair: David Booth
16:22:51 <dbooth> ADJOURNED
16:23:08 <dbooth> rrsagent, draft minutes
16:23:08 <RRSAgent> I have made the request to generate https://www.w3.org/2021/08/19-hcls-minutes.html dbooth