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14:59:16 <dbooth> Meeting: FHIR RDF
14:59:19 <dbooth> Chair: David Booth
15:04:01 <dbooth> Topic: Concept IRIs
15:12:21 <dbooth> dbooth: I think eric's position is that we should allow creativity in the design of concept IRIs, which would require that things like slashes get passed through without percent encoding.
15:12:27 <dbooth> eric: yes.
15:13:26 <dbooth> dbooth: I have sympathy for supporting creativity, but also worry that the designers of these terminologies will probably not be thinking about how their codes will be turned into IRIs.
15:14:01 <dbooth> eric: We could define two different algorithms, with a flag for each stem IRI, that says which algorithm to use.
15:16:53 <dbooth> dbooth: Confirmed that a hash cannot appear in a fragid.
15:18:08 <dbooth> eric: We could more fully parameterize the algorithm depending on what part of the IRI it falls into: path, search parameter, fragid, etc.
15:19:52 <dbooth> eric: SNOMED has a hierarchy, eg a procedure or an abstract value or reference range -- they all have their own places in the SNOMED hierarchy.  If Kent Spackman did it again, he could take that into account.
15:23:09 <dbooth> gaurav: If codesystem (or a new property that goes with stem IRI) tells you how to validate the code, then that will tell you how we need to encode it?
15:23:47 <dbooth> ... E.g., if SNOMED says that slash is allowed in codes, then we can pass it through without encoding it.
15:24:09 <dbooth> ... For most wiki codes, they give  a regex and a template.
15:26:50 <dbooth> gaurav: For FHIR codesystem, you can define a filter to only included certain codes.
15:27:22 <dbooth> ... They also allow regex to filter them.
15:28:01 <dbooth> ... And you can have multiple filters, and 8-9 operators and they don't expect implementers to implement them all.
15:30:08 <dbooth> dbooth: Exactly which chars are we concerned about?  Only slash, and always encode hashes?  Or are there other other chars we might want to pass through?
15:30:55 <dbooth> eric: hash, question mark, ampersand, semicolon, equals, slash.
15:32:57 <dbooth> eric: For SNOMED you'd want to encode everything, because if somebody used a postcoordinated code w comments in it, that should be percent encoded.
15:34:52 <dbooth> dbooth: Is there other data that would help us decide?  Look at what chars are used in codes?
15:35:51 <dbooth> gaurav: UCUM has slashes, square brackets, asterisk, percent (for percentages), curly brackets.
15:37:47 <dbooth> dbooth: That's an example of slashes clearly not being used for hierarchy -- they're used for division.
15:38:48 <dbooth> eric: There's also two schools of though about where to put units -- into the quoted part of the RDF term, vs into the datatype.
15:39:57 <dbooth> UCUM examples:
15:39:58 <dbooth> [[
15:39:59 <dbooth> h
15:39:59 <dbooth> U
15:39:59 <dbooth> ug
15:39:59 <dbooth> [IU]
15:40:00 <dbooth> mg/m2
15:40:04 <dbooth> ml/h
15:40:06 <dbooth> kcal
15:40:08 <dbooth> cal/mL
15:40:10 <dbooth> mL/d
15:40:12 <dbooth> mL/h
15:40:14 <dbooth> cal/[foz_us]
15:40:16 <dbooth> [foz_us]
15:40:18 <dbooth> {scoop}
15:40:20 <dbooth> {score}
15:40:22 <dbooth> ]]
15:48:03 <dbooth> dbooth: I think we need more evidence about what chars are used in codes.
15:48:26 <dbooth> eric: Could have a conservative algo and a liberal algo.
15:50:06 <dbooth> gaurav: I like that idea.  But an example had old codes that were no longer resolvable, eg LOINC code: LA6721-0
15:50:59 <dbooth> ... Could say that this algo only applies if the code matches ##### (all digits)
15:59:13 <dbooth> ACTION: Gaurav to find codes in  more terminologies to see what chars they use.
15:59:38 <dbooth> dagmar: In our work we should always end a stem IRI with slash or hash.
16:01:08 <dbooth> Present: David Booth, Gaurav Vaidya, Dagmar, EricP
16:01:12 <dbooth> rrsagent, draft minutes
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16:39:13 <dbooth> ADJOURNED
16:39:16 <dbooth> rrsagent, draft minutes
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