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14:57:34 <dbooth> rrsagent, make logs public
14:57:40 <dbooth> Meeting: FHIR RDF
14:57:43 <dbooth> Chair: David Booth
15:01:42 <dbooth> Topic: DICOM
15:02:30 <dbooth> https://github.com/w3c/hcls-fhir-rdf/issues/141
15:03:50 <dbooth> erich: Favor option 5. Prob most favorable to DICOM community too.  And suggest a mapping to option 9.
15:05:07 <dbooth> detlef: Why would we need option 5?
15:05:41 <dbooth> erich: It keeps the datatype.  But 9 is nice and clean, easy to look at.
15:07:01 <dbooth> erich: I would use 9 internally, because I have 20B triples, and it saves a lot of triples by dropping the datatypes.
15:08:29 <dbooth> eric: I like 5
15:11:05 <dbooth> gaurav: this looks good. Like the null flavor.  Favor 5.
15:12:38 <dbooth> jim:  Does option 9 deal with comparing things, to know if they are the same value?
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15:25:42 <dbooth> https://dicom.nema.org/medical/dicom/current/output/chtml/part05/sect_6.2.html
15:28:32 <dbooth> dbooth: Sounds like we have converged for handling nulls, on using a bnode with a type sentinal.  Which type for null flavor?
15:28:44 <dbooth> erich: I recommend we use dicom null flavors.
15:28:56 <dbooth> detlef: Agreed.
15:34:02 <dbooth> detlef: json null is used when a number is missing.
15:34:22 <dbooth> ... In other contexts, an empty string is used.
15:41:25 <dbooth> dbooth: Do we want to use a separate empty-string-null vs a numeric-null?
15:42:59 <dbooth> eric: If we don't distinguish between them, it might make round tripping harder.
15:43:36 <dbooth> ... If the spec is complete enough to know the types of all properties, and no property that allows both numeric and string, then we could use that for round tripping.
15:44:42 <dbooth> erich: The dicom:vr is always there to indicate the type
15:44:59 <dbooth> ... Option 5 may work better for the general case, in dealing w that.
15:45:38 <dbooth> ... Certain properties are required, so empty string is used if you don't have a value.
15:57:18 <dbooth> eric: Suspect we need to do a survey of the VRs
15:57:34 <dbooth> ... Could decide what we want as a null standoff.
15:58:01 <dbooth> ... Then pospone the question of whether to use a single top null type vs two.
15:58:38 <dbooth> ... Then do a survey on the VR types.  If you could do it over, would you use emptry string for null?
15:59:06 <dbooth> ... And can we use microparsing to reconstruct the empty string or numeric null
15:59:42 <dbooth> ACTION: Erich to look at VR types to see how they map to xsd datatypes
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17:48:50 <dbooth> ADJOURNED
17:49:57 <dbooth> Present: David Booth, EricP, Erich Bremer, Detlef Grittner, Gaurav Vaidya, Jim Balhoff
17:50:36 <dbooth> rrsagent, draft minutes
17:50:38 <RRSAgent> I have made the request to generate https://www.w3.org/2024/06/13-hcls-minutes.html dbooth
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