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14:56:40 <dbooth> rrsagent, make logs public
14:56:53 <dbooth> Meeting: FHIR RDF
14:56:57 <dbooth> Chair: David Booth
15:06:14 <dbooth> Topic: Complex Data Types
15:08:05 <dbooth> https://www.lassila.org/publications/2024/HartigEtAl_SPARQLCDTs_PosterPaper2024.pdf
15:08:49 <dbooth> Present: Erich Bremer, Detlef Grittner, David Booth
15:11:14 <dbooth> erich: Complex Data Types (CDT) is implemented in Jena
15:11:46 <dbooth> ... And RDF lists can be turned into CDT arrays.
15:12:09 <dbooth> ... CDT is a proposal
15:12:41 <dbooth> ... We also need a standardbinary representation of RDF.
15:13:03 <dbooth> ... RDF HDT allows query on it.
15:13:42 <dbooth> ... They treat all literals as a string, which doesn't work well for a lot of numeric data, but it's very fast.
15:13:52 <dbooth> ... Great for huge amounts of data.
15:14:16 <dbooth> ... I used it with Apache Arrow that I made.
15:14:50 <dbooth> ... HDF5 is use in the scientific world, like an intelligent zip file.  Chunks can be compressed, but you can pull out parts.
15:15:11 <dbooth> ... I'm putting the guts of HDT into HDF5.
15:16:34 <dbooth> ... OpenLink Software won't touch it if it isn't a standard.
15:21:48 <dbooth> ... I harvested all of the imaging commons data and it was 90 TB of data, and pulled out all the metadata in a week.
15:22:39 <dbooth> ... I'm working on a SOLID project -- Java library that wraps a read/write storage for linked web storage.
15:22:48 <dbooth> ... Want to use it for image annotations and displays.
15:25:25 <dbooth> dbooth: Any SPARQL implementatoins of CDT yet?
15:25:42 <dbooth> erich: Only the Jena SPARQLstore.
15:31:07 <dbooth> erich: CDT paper: https://awslabs.github.io/SPARQL-CDTs/spec/latest.html
15:31:17 <dbooth> ... also this: https://www.amazon.science/publications/datatypes-for-lists-and-maps-in-rdf-literals
15:32:11 <dbooth> ... I also suggested allowing JSON paths
15:34:44 <dbooth> dbooth: Community group is a good step toward official W3C working group
15:36:35 <dbooth> detlef: From a theoretical standpoing, the hierarchical approach in DICOM is the right way to do it
15:36:49 <dbooth> ... You have to connect to the UIDs of the entities
15:38:31 <dbooth> https://dl.gi.de/items/6ae82b4a-c2c8-4d7e-b45b-088e82080f99
15:39:16 <dbooth> i/hierar/erich: Need to remove redundancy in the file
15:41:06 <dbooth> erich: The HDT source code is GPL.  I'd rather have it MIT or Apache 2 license.
15:41:20 <dbooth> ... but it squeezes the data down a lot.
15:42:05 <dbooth> ... I doesn't need to be serialized/deserialized.  Like a direct memory copy.
15:43:21 <dbooth> ... HDF5 is used for a lot of learning models.
15:44:43 <dbooth> ... The ordering of the HDT  data is not currently usable.
15:45:05 <dbooth> ... I'm stuffing HDT data into HDF5.
15:59:26 <dbooth> ADJOURNED
15:59:31 <dbooth> rrsagent, draft minutes
15:59:32 <RRSAgent> I have made the request to generate https://www.w3.org/2025/05/08-hcls-minutes.html dbooth