Technical Metadata Call 2015-04-28

Owned by Bill Branan
Jun 16, 2017
3 min read

Time: 8:30am PDT / 11:30am EDT

Call-In Info: Google Hangout: https://plus.google.com/hangouts/_/event/cpt6do5qc6l6mt4g853rqolk5tk

Moderator: Aaron Coburn (Amherst College)

Notetaker: 

Attendees:

Regrets:



Agenda:

  1. Review proposed technical metadata application profile
    1. premis vs. ebucore for equivalent properties
    2. Additional baseline properties
      1. premis:Agent / prov:SoftwareAgent
      2. nfo:fileUrl / rdfs:seeAlso / edm:isRepresentationOf
    3. Specialized properties (more on this later, after the baseline is complete)
      1. dct:extent / exif:width / ebucore:width
      2. exif:bitsPerSecond
      3. ...
  2. Review sample mappings: europeana, others?
  3. Recommendations for workflow tools
    1. FITS
    2. Europeana: https://github.com/europeana/contrib/tree/master/ntua/mediachecker 
  4. NonRDF Technical metadata and PCDM (via pcdm:hasRelatedFile)
    1. structural predicates
      1. edm:isDerivationOf / prov:wasDerivedFrom
  5. ...

Actions

 

Notes:

 

  • First cut at Application Profile:
    https://docs.google.com/document/u/2/d/1SZCpSIdlGfXgoYrAnW2eRKlIt6O-1ADIDDhmLrvxeLc/edit#heading=h.a8hurtypz8qi
    • Baseline core properties
    • Based on Justin's spreadsheet for documnt, media, AV
    • LDCX, people looking at NFO & Pronom
    • PBCore combining with ebucore. This also met Europeana use cases, so baseline draws on EBUCore.
    • AP also includes equiv props from other namespaces
    • Q from Aaron: Premis already supported by and used in Fedora. Do we want to privledge one or the other of Premis v. EBUCore
      • Julie: potentially better to do Premis if already used. Maybe focus those on preservation?
      • Jon: Another approach is to find the vocab closest to having everything we need, but causes least domain strife
      • Consensus seems to be using EbuCore as much as possible, with understanding that some Premis should map to equiv.
    • Corey: Needs to be possible to override a property choice.
    • Q from Jon: How to implement over-ridability. 
      • Corey: I suggest that the property definition lives in Hydra. 
      • Jon: But silly to recreate Fedora-wheels. Maybe map properties to Fedora Internals. Acknowledge overlap.
    • Q from Hugo: Being aware of type inconsistencies. Example, ebucore:fileSize specified as xsd:double, though Europeana's profile expresses as bytes, which are xsd:long
    • Name of original file? Where does this go? What is ebuCore:filename? How does map to Premis:hasOriginalFile. Property to map full path? 
      • ACTION ALL: Capture questions like these as comments on the google doc. 
  • Specialized properties:
    • These should end up covered by EbuCore 
    • We can probably persue those more slowly
    • Jon: Make sure there's not a breaker at a lower level. 
    • ACTION: All look at some edge cases. A Web Archive. 
    • ACTION: Jon: Images. Hardware & Sofware Questions.
      • Diff between image production, image capture, and image software. 
    • Justin: Question about predicates defined specific to types, or just a long list of predicates. See barmintor's PCDM PR.
      https://github.com/duraspace/pcdm/pull/2
    • Justin: Define best practices per doc type
  • NonRDF Tech Metadata. 
    • Tools that Generate non-RDF: FITS, etc.
    • How to do this
    • pcdm:hasRelatedFile for things that are related but not the object itself. 
    • Aaron looking to other vocabs to structure it more. Multiple related files. Example of a file with & without a color target. Tech MD about each.
    •  edm:isDerivationOf; prov:wasDerivedFrom.
    • derivatives are different from tech MD generated from an object. Perhaps we grab an "isMetadataFor"
    • Possibly rdf:Description, or ore:describes, (or even foaf:focus?)
  • Other General Topics:
    • Jon Q: Property that might be missing. Byte Order.
    • PBCore is working with EbuCore -- may be able to get stuff added. 
    • Sweet from Jet Propulsion Library has Byte Order. Jon also comes back to it for representations of units of measure.
      http://sweet.jpl.nasa.gov/2.2/reprDataFormat.owl#byteOrder
      https://sweet.jpl.nasa.gov/sweet2.2
      • Maybe good to find another source, since we don't want to import giant vocab for one property.
    • EBUCoreHash vs. a Premis Proeprty
    • Convo about Provenance -- Defer to next week? Software agent, etc. 
  • Do we need to get everything to them by the end of this week? 
    • ACTION: Aaron/Jon/Julie: Note to the sprint group by Thursday giving update:
      • Here's what we've done
      • Here's our open issues
      • Here's our next steps